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an = n(n-1)!

10! = 1

21! = 2

32! = 9

43! = 4096

54! = 59 604 644 775 390 625

Next two terms would be

65!

76!

Except for the 36.

Oops :blink: seems i forgot to remove the 36.

but it was meant to be different. :dry: Last time i checked, 4^3=64 not 4096

unless you meant

with the 3 you meant the third term in the series.

For an equation i would have put An=nA(n-1)

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