Quick Reference
0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800
12! = 479001600
15! = 13076743... (13d)
20! = 24329020... (19d)
25! = 15511210... (26d)
50! = 30414093... (65d)
100! = 93326215... (158d)
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