n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 2 |
4 | 12 |
5 | 60 |
6 | 60 |
7 | 280 |
8 | 40320 |
9 | 22680 |
10 | 3628800 |
11 | 1900800 |
12 | 479001600 |
13 | 6227020800 |
14 | 6227020800 |
15 | 1307674368000 |
16 | 1307674368000 |
17 | 13680285696000 |
18 | 582033973248000 |
19 | 24329020081766400 |
20 | 2432902008176640000 |
[1,2,2,12,60,60,280,40320,22680,3628800,1900800, 479001600,6227020800,6227020800,1307674368000, 1307674368000,13680285696000,582033973248000, 24329020081766400,2432902008176640000] |