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Factorial

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In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example:

5! = 5 * 4 * 3 * 2 * 1 = 120
n n!
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5 040
8 40 320
9 362 880
10 3 628 800
11 39 916 800
12 479 001 600
13 6 227 020 800
14 87 178 291 200
15 1 307 674 368 000

References

Wikipedia