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You are going to place all numbers from 1 to 16 on a 4x4 chessboard such that all consecutive number pairs (1-2, 2-3, ..., 15-16) will be on the neighboring cells (left-right-top-down).

In how many different ways can this be done?

If the question was asked for a 2x2 chessboard, the answer would be 8.

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I've tried to do it for a 3x3 square, all you need to do here is just try to fit in a 9 cell long chain inside the sqare where the first cell is 1, connected to 2, connected to 3...etc

Each unique way can have up to 16 other versions of itself by using 3 operations: Rotation, Mirror and Inversion (starting from the end), although not all are different, sometimes if you rotate something then invert it you're back to the starting position...

So I made a drawing of how a 3x3 cube can connect and each version how many different clones it can make through rotating mirroring and inverting:

post-29022-002375000 1282211097.png

So for 3x3 square you have 40 different ways, for 2x2 there was only 1 version and it can only be rotated and inverted:

post-29022-074321800 1282211097.png

So there are 8...

Now doing it for 4 is way too complicated cause for a 4x4 square there are lots more versions and very hard to see which is unique, but this work didn't go to waste, I now know there are 8 versions for a 2x2 square and 40 for a 3x3 square, time to bust out ActionScript...

1 4

2 3


1 2

4 3


4 1

3 2


2 1

3 4


2 3

1 4


4 3

1 2


3 2

4 1


3 4

2 1


Total: 8

1 6 7

2 5 8

3 4 9


1 8 7

2 9 6

3 4 5


1 8 9

2 7 6

3 4 5


1 4 5

2 3 6

9 8 7


1 2 9

4 3 8

5 6 7


1 2 3

8 7 4

9 6 5


1 2 3

8 9 4

7 6 5


1 2 3

6 5 4

7 8 9


7 6 1

8 5 2

9 4 3


7 8 1

6 9 2

5 4 3


9 8 1

6 7 2

5 4 3


5 4 1

6 3 2

7 8 9


9 2 1

8 3 4

7 6 5


3 2 1

4 7 8

5 6 9


3 2 1

4 9 8

5 6 7


3 2 1

4 5 6

9 8 7


7 6 5

8 1 4

9 2 3


5 6 7

4 1 8

3 2 9


9 2 3

8 1 4

7 6 5


3 2 9

4 1 8

5 6 7


7 8 9

6 1 2

5 4 3


5 4 3

6 1 2

7 8 9


9 8 7

2 1 6

3 4 5


3 4 5

2 1 6

9 8 7


3 4 9

2 5 8

1 6 7


3 4 5

2 9 6

1 8 7


3 4 5

2 7 6

1 8 9


9 8 7

2 3 6

1 4 5


5 6 7

4 3 8

1 2 9


9 6 5

8 7 4

1 2 3


7 6 5

8 9 4

1 2 3


7 8 9

6 5 4

1 2 3


9 4 3

8 5 2

7 6 1


5 4 3

6 9 2

7 8 1


5 4 3

6 7 2

9 8 1


7 8 9

6 3 2

5 4 1


7 6 5

8 3 4

9 2 1


5 6 9

4 7 8

3 2 1


5 6 7

4 9 8

3 2 1


9 8 7

4 5 6

3 2 1


Total: 40
Now that I know they both worked, we go for 4x4 aaaaand:
1 8 9 16

2 7 10 15

3 6 11 14

4 5 12 13


1 8 9 10

2 7 16 11

3 6 15 12

4 5 14 13


1 8 9 10

2 7 12 11

3 6 13 16

4 5 14 15


1 8 9 10

2 7 12 11

3 6 13 14

4 5 16 15


1 16 15 14

2 7 8 13

3 6 9 12

4 5 10 11


1 16 13 12

2 15 14 11

3 6 7 10

4 5 8 9


1 14 13 12

2 15 16 11

3 6 7 10

4 5 8 9


1 14 15 16

2 13 12 11

3 6 7 10

4 5 8 9


1 10 11 12

2 9 8 13

3 6 7 14

4 5 16 15


1 16 11 10

2 15 12 9

3 14 13 8

4 5 6 7


1 12 11 10

2 13 16 9

3 14 15 8

4 5 6 7


1 12 11 10

2 13 14 9

3 16 15 8

4 5 6 7


1 14 15 16

2 13 10 9

3 12 11 8

4 5 6 7


1 14 13 12

2 15 10 11

3 16 9 8

4 5 6 7


1 12 13 16

2 11 14 15

3 10 9 8

4 5 6 7


1 12 13 14

2 11 16 15

3 10 9 8

4 5 6 7


1 16 15 14

2 11 12 13

3 10 9 8

4 5 6 7


1 6 7 8

2 5 10 9

3 4 11 12

16 15 14 13


1 8 9 10

2 7 6 11

3 4 5 12

16 15 14 13


1 16 15 14

2 3 12 13

5 4 11 10

6 7 8 9


1 4 5 16

2 3 6 15

9 8 7 14

10 11 12 13


1 4 5 6

2 3 16 7

13 14 15 8

12 11 10 9


1 4 5 6

2 3 8 7

15 14 9 10

16 13 12 11


1 4 5 6

2 3 8 7

15 16 9 10

14 13 12 11


1 4 5 6

2 3 8 7

11 10 9 16

12 13 14 15


1 16 15 14

2 3 4 13

7 6 5 12

8 9 10 11


1 2 7 8

16 3 6 9

15 4 5 10

14 13 12 11


1 2 5 6

16 3 4 7

15 12 11 8

14 13 10 9


1 2 15 14

4 3 16 13

5 8 9 12

6 7 10 11


1 2 15 16

4 3 14 13

5 8 9 12

6 7 10 11


1 2 11 12

4 3 10 13

5 8 9 14

6 7 16 15


1 2 13 12

4 3 14 11

5 16 15 10

6 7 8 9


1 2 9 10

4 3 8 11

5 6 7 12

16 15 14 13


1 2 3 16

8 7 4 15

9 6 5 14

10 11 12 13


1 2 3 16

6 5 4 15

7 10 11 14

8 9 12 13


1 2 3 4

16 11 10 5

15 12 9 6

14 13 8 7


1 2 3 4

12 11 10 5

13 16 9 6

14 15 8 7


1 2 3 4

12 11 10 5

13 14 9 6

16 15 8 7


1 2 3 4

14 15 16 5

13 10 9 6

12 11 8 7


1 2 3 4

14 13 12 5

15 10 11 6

16 9 8 7


1 2 3 4

12 13 16 5

11 14 15 6

10 9 8 7


1 2 3 4

12 13 14 5

11 16 15 6

10 9 8 7


1 2 3 4

16 15 14 5

11 12 13 6

10 9 8 7


1 2 3 4

14 13 6 5

15 12 7 8

16 11 10 9


1 2 3 4

14 15 6 5

13 16 7 8

12 11 10 9


1 2 3 4

16 15 6 5

13 14 7 8

12 11 10 9


1 2 3 4

10 9 6 5

11 8 7 16

12 13 14 15


1 2 3 4

16 7 6 5

15 8 9 10

14 13 12 11


1 2 3 4

8 7 6 5

9 12 13 16

10 11 14 15


1 2 3 4

8 7 6 5

9 12 13 14

10 11 16 15


1 2 3 4

8 7 6 5

9 16 15 14

10 11 12 13


1 2 3 4

8 7 6 5

9 10 11 12

16 15 14 13


16 1 6 7

15 2 5 8

14 3 4 9

13 12 11 10


16 1 4 5

15 2 3 6

14 11 10 7

13 12 9 8


16 1 2 3

15 10 9 4

14 11 8 5

13 12 7 6


16 1 2 3

15 14 13 4

10 11 12 5

9 8 7 6


16 1 2 3

15 14 5 4

12 13 6 7

11 10 9 8


16 1 2 3

15 6 5 4

14 7 8 9

13 12 11 10


2 1 16 15

3 8 9 14

4 7 10 13

5 6 11 12


2 1 10 11

3 8 9 12

4 7 16 13

5 6 15 14


2 1 10 11

3 8 9 12

4 7 14 13

5 6 15 16


2 1 14 13

3 16 15 12

4 7 8 11

5 6 9 10


2 1 12 13

3 10 11 14

4 9 8 15

5 6 7 16


2 1 12 11

3 16 13 10

4 15 14 9

5 6 7 8


2 1 12 11

3 14 13 10

4 15 16 9

5 6 7 8


2 1 14 15

3 12 13 16

4 11 10 9

5 6 7 8


2 1 16 15

3 12 13 14

4 11 10 9

5 6 7 8


2 1 8 9

3 4 7 10

16 5 6 11

15 14 13 12


2 1 12 13

3 4 11 14

6 5 10 15

7 8 9 16


2 1 14 13

3 4 15 12

6 5 16 11

7 8 9 10


2 1 14 15

3 4 13 16

6 5 12 11

7 8 9 10


2 1 16 15

3 4 13 14

6 5 12 11

7 8 9 10


2 1 16 15

3 4 5 14

8 7 6 13

9 10 11 12


2 1 6 7

3 4 5 8

16 13 12 9

15 14 11 10


2 1 6 7

3 4 5 8

14 13 12 9

15 16 11 10


2 1 6 7

3 4 5 8

14 15 16 9

13 12 11 10


2 1 6 7

3 4 5 8

12 11 10 9

13 14 15 16


7 6 1 16

8 5 2 15

9 4 3 14

10 11 12 13


5 4 1 16

6 3 2 15

7 10 11 14

8 9 12 13


15 16 1 2

14 9 8 3

13 10 7 4

12 11 6 5


11 10 1 2

12 9 8 3

13 16 7 4

14 15 6 5


11 10 1 2

12 9 8 3

13 14 7 4

16 15 6 5


13 14 1 2

12 15 16 3

11 8 7 4

10 9 6 5


13 12 1 2

14 11 10 3

15 8 9 4

16 7 6 5


11 12 1 2

10 13 16 3

9 14 15 4

8 7 6 5


11 12 1 2

10 13 14 3

9 16 15 4

8 7 6 5


15 14 1 2

16 13 12 3

9 10 11 4

8 7 6 5


15 16 1 2

14 13 12 3

9 10 11 4

8 7 6 5


13 12 1 2

14 11 4 3

15 10 5 6

16 9 8 7


13 14 1 2

12 15 4 3

11 16 5 6

10 9 8 7


15 14 1 2

16 13 4 3

11 12 5 6

10 9 8 7


15 16 1 2

14 13 4 3

11 12 5 6

10 9 8 7


9 8 1 2

10 7 4 3

11 6 5 16

12 13 14 15


15 16 1 2

14 5 4 3

13 6 7 8

12 11 10 9


7 6 1 2

8 5 4 3

9 12 13 16

10 11 14 15


7 6 1 2

8 5 4 3

9 12 13 14

10 11 16 15


7 6 1 2

8 5 4 3

9 16 15 14

10 11 12 13


7 6 1 2

8 5 4 3

9 10 11 12

16 15 14 13


3 2 1 16

4 9 10 15

5 8 11 14

6 7 12 13


3 2 1 16

4 13 14 15

5 12 11 10

6 7 8 9


3 2 1 16

4 5 14 15

7 6 13 12

8 9 10 11


3 2 1 16

4 5 6 15

9 8 7 14

10 11 12 13


16 9 8 1

15 10 7 2

14 11 6 3

13 12 5 4


10 9 8 1

11 16 7 2

12 15 6 3

13 14 5 4


10 9 8 1

11 12 7 2

16 13 6 3

15 14 5 4


10 9 8 1

11 12 7 2

14 13 6 3

15 16 5 4


14 15 16 1

13 8 7 2

12 9 6 3

11 10 5 4


12 13 16 1

11 14 15 2

10 7 6 3

9 8 5 4


12 13 14 1

11 16 15 2

10 7 6 3

9 8 5 4


16 15 14 1

11 12 13 2

10 7 6 3

9 8 5 4


12 11 10 1

13 8 9 2

14 7 6 3

15 16 5 4


10 11 16 1

9 12 15 2

8 13 14 3

7 6 5 4


10 11 12 1

9 16 13 2

8 15 14 3

7 6 5 4


10 11 12 1

9 14 13 2

8 15 16 3

7 6 5 4


16 15 14 1

9 10 13 2

8 11 12 3

7 6 5 4


12 13 14 1

11 10 15 2

8 9 16 3

7 6 5 4


16 13 12 1

15 14 11 2

8 9 10 3

7 6 5 4


14 13 12 1

15 16 11 2

8 9 10 3

7 6 5 4


14 15 16 1

13 12 11 2

8 9 10 3

7 6 5 4


8 7 6 1

9 10 5 2

12 11 4 3

13 14 15 16


10 9 8 1

11 6 7 2

12 5 4 3

13 14 15 16


14 15 16 1

13 12 3 2

10 11 4 5

9 8 7 6


16 5 4 1

15 6 3 2

14 7 8 9

13 12 11 10


6 5 4 1

7 16 3 2

8 15 14 13

9 10 11 12


6 5 4 1

7 8 3 2

16 9 10 11

15 14 13 12


6 5 4 1

7 8 3 2

10 9 14 15

11 12 13 16


6 5 4 1

7 8 3 2

10 9 16 15

11 12 13 14


14 15 16 1

13 4 3 2

12 5 6 7

11 10 9 8


8 7 2 1

9 6 3 16

10 5 4 15

11 12 13 14


14 15 2 1

13 16 3 4

12 9 8 5

11 10 7 6


16 15 2 1

13 14 3 4

12 9 8 5

11 10 7 6


12 11 2 1

13 10 3 4

14 9 8 5

15 16 7 6


12 13 2 1

11 14 3 4

10 15 16 5

9 8 7 6


10 9 2 1

11 8 3 4

12 7 6 5

13 14 15 16


6 5 2 1

7 4 3 16

8 11 12 15

9 10 13 14


16 3 2 1

15 4 7 8

14 5 6 9

13 12 11 10


16 3 2 1

15 4 5 6

14 11 10 7

13 12 9 8


4 3 2 1

5 10 11 16

6 9 12 15

7 8 13 14


4 3 2 1

5 10 11 12

6 9 16 13

7 8 15 14


4 3 2 1

5 10 11 12

6 9 14 13

7 8 15 16


4 3 2 1

5 16 15 14

6 9 10 13

7 8 11 12


4 3 2 1

5 12 13 14

6 11 10 15

7 8 9 16


4 3 2 1

5 16 13 12

6 15 14 11

7 8 9 10


4 3 2 1

5 14 13 12

6 15 16 11

7 8 9 10


4 3 2 1

5 14 15 16

6 13 12 11

7 8 9 10


4 3 2 1

5 6 9 10

16 7 8 11

15 14 13 12


4 3 2 1

5 6 13 14

8 7 12 15

9 10 11 16


4 3 2 1

5 6 15 14

8 7 16 13

9 10 11 12


4 3 2 1

5 6 15 16

8 7 14 13

9 10 11 12


4 3 2 1

5 6 7 16

10 9 8 15

11 12 13 14


4 3 2 1

5 6 7 8

16 13 12 9

15 14 11 10


4 3 2 1

5 6 7 8

14 13 12 9

15 16 11 10


4 3 2 1

5 6 7 8

14 15 16 9

13 12 11 10


4 3 2 1

5 6 7 8

12 11 10 9

13 14 15 16


16 15 14 13

1 6 7 12

2 5 8 11

3 4 9 10


16 15 12 11

1 14 13 10

2 5 6 9

3 4 7 8


16 15 10 9

1 14 11 8

2 13 12 7

3 4 5 6


16 15 14 13

1 10 11 12

2 9 8 7

3 4 5 6


2 3 8 9

1 4 7 10

16 5 6 11

15 14 13 12


2 3 12 13

1 4 11 14

6 5 10 15

7 8 9 16


2 3 14 13

1 4 15 12

6 5 16 11

7 8 9 10


2 3 14 15

1 4 13 16

6 5 12 11

7 8 9 10


2 3 16 15

1 4 13 14

6 5 12 11

7 8 9 10


2 3 16 15

1 4 5 14

8 7 6 13

9 10 11 12


2 3 6 7

1 4 5 8

16 13 12 9

15 14 11 10


2 3 6 7

1 4 5 8

14 13 12 9

15 16 11 10


2 3 6 7

1 4 5 8

14 15 16 9

13 12 11 10


2 3 6 7

1 4 5 8

12 11 10 9

13 14 15 16


2 3 4 5

1 12 11 6

16 13 10 7

15 14 9 8


2 3 4 5

1 12 11 6

14 13 10 7

15 16 9 8


2 3 4 5

1 14 15 6

12 13 16 7

11 10 9 8


2 3 4 5

1 16 15 6

12 13 14 7

11 10 9 8


2 3 4 5

1 10 9 6

12 11 8 7

13 14 15 16


2 3 4 5

1 16 7 6

14 15 8 9

13 12 11 10


2 3 4 5

1 8 7 6

16 9 10 11

15 14 13 12


2 3 4 5

1 8 7 6

10 9 14 15

11 12 13 16


2 3 4 5

1 8 7 6

10 9 16 15

11 12 13 14


16 15 14 13

1 2 11 12

4 3 10 9

5 6 7 8


16 15 14 13

1 2 3 12

6 5 4 11

7 8 9 10


13 12 11 10

14 1 8 9

15 2 7 6

16 3 4 5


7 8 9 16

6 1 10 15

5 2 11 14

4 3 12 13


7 8 9 10

6 1 16 11

5 2 15 12

4 3 14 13


7 8 9 10

6 1 12 11

5 2 13 16

4 3 14 15


7 8 9 10

6 1 12 11

5 2 13 14

4 3 16 15


15 16 5 6

14 1 4 7

13 2 3 8

12 11 10 9


7 6 5 16

8 1 4 15

9 2 3 14

10 11 12 13


13 14 15 16

12 1 4 5

11 2 3 6

10 9 8 7


9 8 7 6

10 1 4 5

11 2 3 16

12 13 14 15


11 12 13 16

10 1 14 15

9 2 3 4

8 7 6 5


11 12 13 14

10 1 16 15

9 2 3 4

8 7 6 5


15 14 13 12

16 1 10 11

3 2 9 8

4 5 6 7


5 6 7 8

4 1 10 9

3 2 11 12

16 15 14 13


3 2 15 14

4 1 16 13

5 8 9 12

6 7 10 11


3 2 15 16

4 1 14 13

5 8 9 12

6 7 10 11


3 2 11 12

4 1 10 13

5 8 9 14

6 7 16 15


3 2 13 12

4 1 14 11

5 16 15 10

6 7 8 9


3 2 9 10

4 1 8 11

5 6 7 12

16 15 14 13


11 10 9 8

12 1 2 7

13 16 3 6

14 15 4 5


11 10 9 8

12 1 2 7

13 14 3 6

16 15 4 5


13 12 11 10

14 1 2 9

15 4 3 8

16 5 6 7


9 10 11 12

8 1 2 13

7 4 3 14

6 5 16 15


15 14 13 12

16 1 2 11

5 4 3 10

6 7 8 9


7 8 9 10

6 1 2 11

5 4 3 12

16 15 14 13


15 16 3 4

14 1 2 5

13 10 9 6

12 11 8 7


5 4 3 16

6 1 2 15

7 10 11 14

8 9 12 13


13 14 15 16

12 1 2 3

11 8 7 4

10 9 6 5


7 6 5 4

8 1 2 3

9 12 13 16

10 11 14 15


7 6 5 4

8 1 2 3

9 12 13 14

10 11 16 15


7 6 5 4

8 1 2 3

9 16 15 14

10 11 12 13


7 6 5 4

8 1 2 3

9 10 11 12

16 15 14 13


3 4 5 16

2 1 6 15

9 8 7 14

10 11 12 13


3 4 5 6

2 1 16 7

13 14 15 8

12 11 10 9


3 4 5 6

2 1 8 7

15 14 9 10

16 13 12 11


3 4 5 6

2 1 8 7

15 16 9 10

14 13 12 11


3 4 5 6

2 1 8 7

11 10 9 16

12 13 14 15


16 9 8 7

15 10 1 6

14 11 2 5

13 12 3 4


10 9 8 7

11 16 1 6

12 15 2 5

13 14 3 4


10 9 8 7

11 12 1 6

16 13 2 5

15 14 3 4


10 9 8 7

11 12 1 6

14 13 2 5

15 16 3 4


10 11 12 13

9 8 1 14

6 7 2 15

5 4 3 16


12 13 14 15

11 10 1 16

8 9 2 3

7 6 5 4


8 7 6 5

9 10 1 4

12 11 2 3

13 14 15 16


16 5 6 7

15 4 1 8

14 3 2 9

13 12 11 10


6 5 16 15

7 4 1 14

8 3 2 13

9 10 11 12


16 15 14 13

5 4 1 12

6 3 2 11

7 8 9 10


6 7 8 9

5 4 1 10

16 3 2 11

15 14 13 12


16 13 12 11

15 14 1 10

4 3 2 9

5 6 7 8


14 13 12 11

15 16 1 10

4 3 2 9

5 6 7 8


14 15 2 3

13 16 1 4

12 9 8 5

11 10 7 6


16 15 2 3

13 14 1 4

12 9 8 5

11 10 7 6


12 11 2 3

13 10 1 4

14 9 8 5

15 16 7 6


12 13 2 3

11 14 1 4

10 15 16 5

9 8 7 6


10 9 2 3

11 8 1 4

12 7 6 5

13 14 15 16


16 5 4 3

15 6 1 2

14 7 8 9

13 12 11 10


6 5 4 3

7 16 1 2

8 15 14 13

9 10 11 12


6 5 4 3

7 8 1 2

16 9 10 11

15 14 13 12


6 5 4 3

7 8 1 2

10 9 14 15

11 12 13 16


6 5 4 3

7 8 1 2

10 9 16 15

11 12 13 14


8 9 10 11

7 2 1 12

6 3 16 13

5 4 15 14


8 9 10 11

7 2 1 12

6 3 14 13

5 4 15 16


12 11 10 9

13 2 1 8

14 3 4 7

15 16 5 6


10 11 12 13

9 2 1 14

8 3 4 15

7 6 5 16


12 13 14 15

11 2 1 16

10 3 4 5

9 8 7 6


10 9 8 7

11 2 1 6

12 3 4 5

13 14 15 16


16 3 4 5

15 2 1 6

14 11 10 7

13 12 9 8


4 3 16 15

5 2 1 14

6 9 10 13

7 8 11 12


16 15 14 13

3 2 1 12

4 7 8 11

5 6 9 10


4 5 6 7

3 2 1 8

16 13 12 9

15 14 11 10


4 5 6 7

3 2 1 8

14 13 12 9

15 16 11 10


4 5 6 7

3 2 1 8

14 15 16 9

13 12 11 10


4 5 6 7

3 2 1 8

12 11 10 9

13 14 15 16


13 14 15 16

12 7 6 1

11 8 5 2

10 9 4 3


11 12 15 16

10 13 14 1

9 6 5 2

8 7 4 3


9 10 15 16

8 11 14 1

7 12 13 2

6 5 4 3


13 14 15 16

12 11 10 1

7 8 9 2

6 5 4 3


13 12 3 2

14 11 4 1

15 10 5 6

16 9 8 7


13 14 3 2

12 15 4 1

11 16 5 6

10 9 8 7


15 14 3 2

16 13 4 1

11 12 5 6

10 9 8 7


15 16 3 2

14 13 4 1

11 12 5 6

10 9 8 7


9 8 3 2

10 7 4 1

11 6 5 16

12 13 14 15


15 16 3 2

14 5 4 1

13 6 7 8

12 11 10 9


7 6 3 2

8 5 4 1

9 12 13 16

10 11 14 15


7 6 3 2

8 5 4 1

9 12 13 14

10 11 16 15


7 6 3 2

8 5 4 1

9 16 15 14

10 11 12 13


7 6 3 2

8 5 4 1

9 10 11 12

16 15 14 13


5 4 3 2

6 11 12 1

7 10 13 16

8 9 14 15


5 4 3 2

6 11 12 1

7 10 13 14

8 9 16 15


5 4 3 2

6 15 14 1

7 16 13 12

8 9 10 11


5 4 3 2

6 15 16 1

7 14 13 12

8 9 10 11


5 4 3 2

6 9 10 1

7 8 11 12

16 15 14 13


5 4 3 2

6 7 16 1

9 8 15 14

10 11 12 13


5 4 3 2

6 7 8 1

15 14 9 10

16 13 12 11


5 4 3 2

6 7 8 1

15 16 9 10

14 13 12 11


5 4 3 2

6 7 8 1

11 10 9 16

12 13 14 15


13 14 15 16

12 11 2 1

9 10 3 4

8 7 6 5


13 14 15 16

12 3 2 1

11 4 5 6

10 9 8 7


15 14 13 12

16 5 6 11

1 4 7 10

2 3 8 9


7 8 9 16

6 5 10 15

1 4 11 14

2 3 12 13


7 8 9 10

6 5 16 11

1 4 15 12

2 3 14 13


7 8 9 10

6 5 12 11

1 4 13 16

2 3 14 15


7 8 9 10

6 5 12 11

1 4 13 14

2 3 16 15


15 14 11 10

16 13 12 9

1 4 5 8

2 3 6 7


15 16 11 10

14 13 12 9

1 4 5 8

2 3 6 7


13 12 11 10

14 15 16 9

1 4 5 8

2 3 6 7


13 14 15 16

12 11 10 9

1 4 5 8

2 3 6 7


9 10 11 12

8 7 6 13

1 4 5 14

2 3 16 15


15 14 9 8

16 13 10 7

1 12 11 6

2 3 4 5


15 16 9 8

14 13 10 7

1 12 11 6

2 3 4 5


11 10 9 8

12 13 16 7

1 14 15 6

2 3 4 5


11 10 9 8

12 13 14 7

1 16 15 6

2 3 4 5


13 14 15 16

12 11 8 7

1 10 9 6

2 3 4 5


13 12 11 10

14 15 8 9

1 16 7 6

2 3 4 5


15 14 13 12

16 9 10 11

1 8 7 6

2 3 4 5


11 12 13 16

10 9 14 15

1 8 7 6

2 3 4 5


11 12 13 14

10 9 16 15

1 8 7 6

2 3 4 5


3 4 9 10

2 5 8 11

1 6 7 12

16 15 14 13


3 4 7 8

2 5 6 9

1 14 13 10

16 15 12 11


3 4 5 6

2 13 12 7

1 14 11 8

16 15 10 9


3 4 5 6

2 9 8 7

1 10 11 12

16 15 14 13


5 6 7 8

4 3 10 9

1 2 11 12

16 15 14 13


7 8 9 10

6 5 4 11

1 2 3 12

16 15 14 13


6 7 16 15

5 8 9 14

4 1 10 13

3 2 11 12


6 7 10 11

5 8 9 12

4 1 16 13

3 2 15 14


6 7 10 11

5 8 9 12

4 1 14 13

3 2 15 16


6 7 8 9

5 16 15 10

4 1 14 11

3 2 13 12


16 15 14 13

5 6 7 12

4 1 8 11

3 2 9 10


16 3 4 5

15 2 7 6

14 1 8 9

13 12 11 10


4 3 12 13

5 2 11 14

6 1 10 15

7 8 9 16


4 3 14 13

5 2 15 12

6 1 16 11

7 8 9 10


4 3 14 15

5 2 13 16

6 1 12 11

7 8 9 10


4 3 16 15

5 2 13 14

6 1 12 11

7 8 9 10


12 11 10 9

13 2 3 8

14 1 4 7

15 16 5 6


10 11 12 13

9 2 3 14

8 1 4 15

7 6 5 16


12 13 14 15

11 2 3 16

10 1 4 5

9 8 7 6


10 9 8 7

11 2 3 6

12 1 4 5

13 14 15 16


8 7 6 5

9 2 3 4

10 1 14 15

11 12 13 16


8 7 6 5

9 2 3 4

10 1 16 15

11 12 13 14


16 15 14 13

3 2 11 12

4 1 10 9

5 6 7 8


4 5 6 7

3 2 9 8

16 1 10 11

15 14 13 12


12 11 8 7

13 10 9 6

14 1 2 5

15 16 3 4


8 9 12 13

7 10 11 14

6 1 2 15

5 4 3 16


14 15 4 5

13 16 3 6

12 1 2 7

11 10 9 8


16 15 4 5

13 14 3 6

12 1 2 7

11 10 9 8


16 5 6 7

15 4 3 8

14 1 2 9

13 12 11 10


6 5 16 15

7 4 3 14

8 1 2 13

9 10 11 12


16 15 14 13

5 4 3 12

6 1 2 11

7 8 9 10


6 7 8 9

5 4 3 10

16 1 2 11

15 14 13 12


10 11 14 15

9 12 13 16

8 1 2 3

7 6 5 4


10 11 16 15

9 12 13 14

8 1 2 3

7 6 5 4


10 11 12 13

9 16 15 14

8 1 2 3

7 6 5 4


16 15 14 13

9 10 11 12

8 1 2 3

7 6 5 4


10 9 6 5

11 8 7 4

12 1 2 3

13 14 15 16


10 11 12 13

9 8 7 14

2 1 6 15

3 4 5 16


12 11 10 9

13 14 15 8

2 1 16 7

3 4 5 6


16 13 12 11

15 14 9 10

2 1 8 7

3 4 5 6


14 13 12 11

15 16 9 10

2 1 8 7

3 4 5 6


12 13 14 15

11 10 9 16

2 1 8 7

3 4 5 6


15 16 7 6

14 9 8 5

13 10 1 4

12 11 2 3


11 10 7 6

12 9 8 5

13 16 1 4

14 15 2 3


11 10 7 6

12 9 8 5

13 14 1 4

16 15 2 3


9 8 7 6

10 15 16 5

11 14 1 4

12 13 2 3


13 14 15 16

12 7 6 5

11 8 1 4

10 9 2 3


13 12 3 4

14 11 2 5

15 10 1 6

16 9 8 7


13 14 3 4

12 15 2 5

11 16 1 6

10 9 8 7


15 14 3 4

16 13 2 5

11 12 1 6

10 9 8 7


15 16 3 4

14 13 2 5

11 12 1 6

10 9 8 7


5 4 3 16

6 7 2 15

9 8 1 14

10 11 12 13


13 14 15 16

12 11 2 3

9 10 1 4

8 7 6 5


7 6 5 4

8 9 2 3

11 10 1 16

12 13 14 15


13 12 11 10

14 3 2 9

15 4 1 8

16 5 6 7


9 10 11 12

8 3 2 13

7 4 1 14

6 5 16 15


15 14 13 12

16 3 2 11

5 4 1 10

6 7 8 9


7 8 9 10

6 3 2 11

5 4 1 12

16 15 14 13


5 6 7 8

4 3 2 9

15 14 1 10

16 13 12 11


5 6 7 8

4 3 2 9

15 16 1 10

14 13 12 11


13 12 11 10

14 7 8 9

15 6 1 2

16 5 4 3


9 10 11 12

8 15 14 13

7 16 1 2

6 5 4 3


15 14 13 12

16 9 10 11

7 8 1 2

6 5 4 3


11 12 13 16

10 9 14 15

7 8 1 2

6 5 4 3


11 12 13 14

10 9 16 15

7 8 1 2

6 5 4 3


13 12 9 8

14 11 10 7

15 2 1 6

16 3 4 5


7 8 11 12

6 9 10 13

5 2 1 14

4 3 16 15


5 4 15 14

6 3 16 13

7 2 1 12

8 9 10 11


5 4 15 16

6 3 14 13

7 2 1 12

8 9 10 11


15 16 5 6

14 3 4 7

13 2 1 8

12 11 10 9


7 6 5 16

8 3 4 15

9 2 1 14

10 11 12 13


13 14 15 16

12 3 4 5

11 2 1 6

10 9 8 7


9 8 7 6

10 3 4 5

11 2 1 16

12 13 14 15


15 14 11 10

16 13 12 9

3 2 1 8

4 5 6 7


15 16 11 10

14 13 12 9

3 2 1 8

4 5 6 7


13 12 11 10

14 15 16 9

3 2 1 8

4 5 6 7


13 14 15 16

12 11 10 9

3 2 1 8

4 5 6 7


5 6 9 10

4 7 8 11

3 2 1 12

16 15 14 13


16 9 8 7

15 10 5 6

14 11 4 1

13 12 3 2


10 9 8 7

11 16 5 6

12 15 4 1

13 14 3 2


10 9 8 7

11 12 5 6

16 13 4 1

15 14 3 2


10 9 8 7

11 12 5 6

14 13 4 1

15 16 3 2


12 13 14 15

11 6 5 16

10 7 4 1

9 8 3 2


10 11 14 15

9 12 13 16

8 5 4 1

7 6 3 2


10 11 16 15

9 12 13 14

8 5 4 1

7 6 3 2


10 11 12 13

9 16 15 14

8 5 4 1

7 6 3 2


16 15 14 13

9 10 11 12

8 5 4 1

7 6 3 2


12 11 10 9

13 6 7 8

14 5 4 1

15 16 3 2


8 9 14 15

7 10 13 16

6 11 12 1

5 4 3 2


8 9 16 15

7 10 13 14

6 11 12 1

5 4 3 2


8 9 10 11

7 16 13 12

6 15 14 1

5 4 3 2


8 9 10 11

7 14 13 12

6 15 16 1

5 4 3 2


16 15 14 13

7 8 11 12

6 9 10 1

5 4 3 2


10 11 12 13

9 8 15 14

6 7 16 1

5 4 3 2


16 13 12 11

15 14 9 10

6 7 8 1

5 4 3 2


14 13 12 11

15 16 9 10

6 7 8 1

5 4 3 2


12 13 14 15

11 10 9 16

6 7 8 1

5 4 3 2


10 9 4 3

11 8 5 2

12 7 6 1

13 14 15 16


8 7 4 3

9 6 5 2

10 13 14 1

11 12 15 16


6 5 4 3

7 12 13 2

8 11 14 1

9 10 15 16


6 5 4 3

7 8 9 2

12 11 10 1

13 14 15 16


8 7 6 5

9 10 3 4

12 11 2 1

13 14 15 16


10 9 8 7

11 4 5 6

12 3 2 1

13 14 15 16


4 5 12 13

3 6 11 14

2 7 10 15

1 8 9 16


4 5 14 13

3 6 15 12

2 7 16 11

1 8 9 10


4 5 14 15

3 6 13 16

2 7 12 11

1 8 9 10


4 5 16 15

3 6 13 14

2 7 12 11

1 8 9 10


4 5 10 11

3 6 9 12

2 7 8 13

1 16 15 14


4 5 16 15

3 6 7 14

2 9 8 13

1 10 11 12


4 5 8 9

3 6 7 10

2 15 14 11

1 16 13 12


4 5 8 9

3 6 7 10

2 15 16 11

1 14 13 12


4 5 8 9

3 6 7 10

2 13 12 11

1 14 15 16


4 5 6 7

3 14 13 8

2 15 12 9

1 16 11 10


4 5 6 7

3 14 15 8

2 13 16 9

1 12 11 10


4 5 6 7

3 16 15 8

2 13 14 9

1 12 11 10


4 5 6 7

3 12 11 8

2 13 10 9

1 14 15 16


4 5 6 7

3 16 9 8

2 15 10 11

1 14 13 12


4 5 6 7

3 10 9 8

2 11 14 15

1 12 13 16


4 5 6 7

3 10 9 8

2 11 16 15

1 12 13 14


4 5 6 7

3 10 9 8

2 11 12 13

1 16 15 14


16 15 14 13

3 4 11 12

2 5 10 9

1 6 7 8


16 15 14 13

3 4 5 12

2 7 6 11

1 8 9 10


10 11 12 13

9 8 7 14

2 3 6 15

1 4 5 16


12 11 10 9

13 14 15 8

2 3 16 7

1 4 5 6


16 13 12 11

15 14 9 10

2 3 8 7

1 4 5 6


14 13 12 11

15 16 9 10

2 3 8 7

1 4 5 6


12 13 14 15

11 10 9 16

2 3 8 7

1 4 5 6


6 7 8 9

5 4 11 10

2 3 12 13

1 16 15 14


8 9 10 11

7 6 5 12

2 3 4 13

1 16 15 14


14 13 12 11

15 4 5 10

16 3 6 9

1 2 7 8


14 13 10 9

15 12 11 8

16 3 4 7

1 2 5 6


6 7 16 15

5 8 9 14

4 3 10 13

1 2 11 12


6 7 10 11

5 8 9 12

4 3 16 13

1 2 15 14


6 7 10 11

5 8 9 12

4 3 14 13

1 2 15 16


6 7 8 9

5 16 15 10

4 3 14 11

1 2 13 12


16 15 14 13

5 6 7 12

4 3 8 11

1 2 9 10


10 11 12 13

9 6 5 14

8 7 4 15

1 2 3 16


8 9 12 13

7 10 11 14

6 5 4 15

1 2 3 16


14 13 8 7

15 12 9 6

16 11 10 5

1 2 3 4


14 15 8 7

13 16 9 6

12 11 10 5

1 2 3 4


16 15 8 7

13 14 9 6

12 11 10 5

1 2 3 4


12 11 8 7

13 10 9 6

14 15 16 5

1 2 3 4


16 9 8 7

15 10 11 6

14 13 12 5

1 2 3 4


10 9 8 7

11 14 15 6

12 13 16 5

1 2 3 4


10 9 8 7

11 16 15 6

12 13 14 5

1 2 3 4


10 9 8 7

11 12 13 6

16 15 14 5

1 2 3 4


16 11 10 9

15 12 7 8

14 13 6 5

1 2 3 4


12 11 10 9

13 16 7 8

14 15 6 5

1 2 3 4


12 11 10 9

13 14 7 8

16 15 6 5

1 2 3 4


12 13 14 15

11 8 7 16

10 9 6 5

1 2 3 4


14 13 12 11

15 8 9 10

16 7 6 5

1 2 3 4


10 11 14 15

9 12 13 16

8 7 6 5

1 2 3 4


10 11 16 15

9 12 13 14

8 7 6 5

1 2 3 4


10 11 12 13

9 16 15 14

8 7 6 5

1 2 3 4


16 15 14 13

9 10 11 12

8 7 6 5

1 2 3 4


13 12 11 10

14 3 4 9

15 2 5 8

16 1 6 7


13 12 9 8

14 11 10 7

15 2 3 6

16 1 4 5


13 12 7 6

14 11 8 5

15 10 9 4

16 1 2 3


9 8 7 6

10 11 12 5

15 14 13 4

16 1 2 3


11 10 9 8

12 13 6 7

15 14 5 4

16 1 2 3


13 12 11 10

14 7 8 9

15 6 5 4

16 1 2 3


5 6 15 14

4 7 16 13

3 8 9 12

2 1 10 11


5 6 15 16

4 7 14 13

3 8 9 12

2 1 10 11


5 6 11 12

4 7 10 13

3 8 9 14

2 1 16 15


5 6 9 10

4 7 8 11

3 16 15 12

2 1 14 13


5 6 7 16

4 9 8 15

3 10 11 14

2 1 12 13


5 6 7 8

4 15 14 9

3 16 13 10

2 1 12 11


5 6 7 8

4 15 16 9

3 14 13 10

2 1 12 11


5 6 7 8

4 11 10 9

3 12 13 16

2 1 14 15


5 6 7 8

4 11 10 9

3 12 13 14

2 1 16 15


15 14 13 12

16 5 6 11

3 4 7 10

2 1 8 9


7 8 9 16

6 5 10 15

3 4 11 14

2 1 12 13


7 8 9 10

6 5 16 11

3 4 15 12

2 1 14 13


7 8 9 10

6 5 12 11

3 4 13 16

2 1 14 15


7 8 9 10

6 5 12 11

3 4 13 14

2 1 16 15


15 14 11 10

16 13 12 9

3 4 5 8

2 1 6 7


15 16 11 10

14 13 12 9

3 4 5 8

2 1 6 7


13 12 11 10

14 15 16 9

3 4 5 8

2 1 6 7


13 14 15 16

12 11 10 9

3 4 5 8

2 1 6 7


9 10 11 12

8 7 6 13

3 4 5 14

2 1 16 15


10 11 12 13

9 4 3 14

8 5 2 15

7 6 1 16


8 9 12 13

7 10 11 14

6 3 2 15

5 4 1 16


14 15 6 5

13 16 7 4

12 9 8 3

11 10 1 2


16 15 6 5

13 14 7 4

12 9 8 3

11 10 1 2


12 11 6 5

13 10 7 4

14 9 8 3

15 16 1 2


10 9 6 5

11 8 7 4

12 15 16 3

13 14 1 2


16 7 6 5

15 8 9 4

14 11 10 3

13 12 1 2


8 7 6 5

9 14 15 4

10 13 16 3

11 12 1 2


8 7 6 5

9 16 15 4

10 13 14 3

11 12 1 2


8 7 6 5

9 10 11 4

16 13 12 3

15 14 1 2


8 7 6 5

9 10 11 4

14 13 12 3

15 16 1 2


16 9 8 7

15 10 5 6

14 11 4 3

13 12 1 2


10 9 8 7

11 16 5 6

12 15 4 3

13 14 1 2


10 9 8 7

11 12 5 6

16 13 4 3

15 14 1 2


10 9 8 7

11 12 5 6

14 13 4 3

15 16 1 2


12 13 14 15

11 6 5 16

10 7 4 3

9 8 1 2


10 11 14 15

9 12 13 16

8 5 4 3

7 6 1 2


10 11 16 15

9 12 13 14

8 5 4 3

7 6 1 2


10 11 12 13

9 16 15 14

8 5 4 3

7 6 1 2


16 15 14 13

9 10 11 12

8 5 4 3

7 6 1 2


12 11 10 9

13 6 7 8

14 5 4 3

15 16 1 2


6 7 12 13

5 8 11 14

4 9 10 15

3 2 1 16


6 7 8 9

5 12 11 10

4 13 14 15

3 2 1 16


8 9 10 11

7 6 13 12

4 5 14 15

3 2 1 16


10 11 12 13

9 8 7 14

4 5 6 15

3 2 1 16


13 12 5 4

14 11 6 3

15 10 7 2

16 9 8 1


13 14 5 4

12 15 6 3

11 16 7 2

10 9 8 1


15 14 5 4

16 13 6 3

11 12 7 2

10 9 8 1


15 16 5 4

14 13 6 3

11 12 7 2

10 9 8 1


11 10 5 4

12 9 6 3

13 8 7 2

14 15 16 1


15 16 5 4

14 7 6 3

13 8 9 2

12 11 10 1


9 8 5 4

10 7 6 3

11 14 15 2

12 13 16 1


9 8 5 4

10 7 6 3

11 16 15 2

12 13 14 1


9 8 5 4

10 7 6 3

11 12 13 2

16 15 14 1


7 6 5 4

8 13 14 3

9 12 15 2

10 11 16 1


7 6 5 4

8 15 14 3

9 16 13 2

10 11 12 1


7 6 5 4

8 15 16 3

9 14 13 2

10 11 12 1


7 6 5 4

8 11 12 3

9 10 13 2

16 15 14 1


7 6 5 4

8 9 16 3

11 10 15 2

12 13 14 1


7 6 5 4

8 9 10 3

15 14 11 2

16 13 12 1


7 6 5 4

8 9 10 3

15 16 11 2

14 13 12 1


7 6 5 4

8 9 10 3

13 12 11 2

14 15 16 1


13 14 15 16

12 11 4 3

9 10 5 2

8 7 6 1


13 14 15 16

12 5 4 3

11 6 7 2

10 9 8 1


13 12 11 10

14 7 8 9

15 6 3 2

16 5 4 1


9 10 11 12

8 15 14 13

7 16 3 2

6 5 4 1


15 14 13 12

16 9 10 11

7 8 3 2

6 5 4 1


11 12 13 16

10 9 14 15

7 8 3 2

6 5 4 1


11 12 13 14

10 9 16 15

7 8 3 2

6 5 4 1


9 8 7 6

10 11 4 5

13 12 3 2

14 15 16 1


11 10 9 8

12 5 6 7

13 4 3 2

14 15 16 1


11 12 13 14

10 5 4 15

9 6 3 16

8 7 2 1


15 16 7 6

14 9 8 5

13 10 3 4

12 11 2 1


11 10 7 6

12 9 8 5

13 16 3 4

14 15 2 1


11 10 7 6

12 9 8 5

13 14 3 4

16 15 2 1


9 8 7 6

10 15 16 5

11 14 3 4

12 13 2 1


13 14 15 16

12 7 6 5

11 8 3 4

10 9 2 1


9 10 13 14

8 11 12 15

7 4 3 16

6 5 2 1


13 12 11 10

14 5 6 9

15 4 7 8

16 3 2 1


13 12 9 8

14 11 10 7

15 4 5 6

16 3 2 1


7 8 13 14

6 9 12 15

5 10 11 16

4 3 2 1


7 8 15 14

6 9 16 13

5 10 11 12

4 3 2 1


7 8 15 16

6 9 14 13

5 10 11 12

4 3 2 1


7 8 11 12

6 9 10 13

5 16 15 14

4 3 2 1


7 8 9 16

6 11 10 15

5 12 13 14

4 3 2 1


7 8 9 10

6 15 14 11

5 16 13 12

4 3 2 1


7 8 9 10

6 15 16 11

5 14 13 12

4 3 2 1


7 8 9 10

6 13 12 11

5 14 15 16

4 3 2 1


15 14 13 12

16 7 8 11

5 6 9 10

4 3 2 1


9 10 11 16

8 7 12 15

5 6 13 14

4 3 2 1


9 10 11 12

8 7 16 13

5 6 15 14

4 3 2 1


9 10 11 12

8 7 14 13

5 6 15 16

4 3 2 1


11 12 13 14

10 9 8 15

5 6 7 16

4 3 2 1


15 14 11 10

16 13 12 9

5 6 7 8

4 3 2 1


15 16 11 10

14 13 12 9

5 6 7 8

4 3 2 1


13 12 11 10

14 15 16 9

5 6 7 8

4 3 2 1


13 14 15 16

12 11 10 9

5 6 7 8

4 3 2 1


Total: 552

So answer is 552...:D

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