n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 2 |
4 | 24 |
5 | 24 |
6 | 720 |
7 | 720 |
8 | 40320 |
9 | 40320 |
10 | 3628800 |
11 | 3628800 |
12 | 479001600 |
13 | 479001600 |
14 | 87178291200 |
15 | 87178291200 |
16 | 20922789888000 |
17 | 20922789888000 |
18 | 6402373705728000 |
19 | 6402373705728000 |
20 | 2432902008176640000 |
21 | 2432902008176640000 |
22 | 1124000727777607680000 |
[1,1,2,2,24,24,720,720,40320,40320,3628800, 3628800,479001600,479001600,87178291200, 87178291200,20922789888000,20922789888000, 6402373705728000,6402373705728000, 2432902008176640000,2432902008176640000, 1124000727777607680000] |