n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 24 |
6 | 120 |
7 | 720 |
8 | 5040 |
9 | 40320 |
10 | 362880 |
11 | 3628800 |
12 | 39916800 |
13 | 479001600 |
14 | 6227020800 |
15 | 87178291200 |
16 | 1307674368000 |
17 | 20922789888000 |
18 | 355687428096000 |
19 | 6402373705728000 |
20 | 121645100408832000 |
21 | 2432902008176640000 |
[0,0,2,6,24,120,720,5040,40320,362880,3628800, 39916800,479001600,6227020800,87178291200, 1307674368000,20922789888000,355687428096000, 6402373705728000,121645100408832000, 2432902008176640000] |