n | a(n) |
---|---|
2 | 2 |
3 | 3 |
4 | 40 |
5 | 105 |
6 | 1584 |
7 | 5985 |
8 | 107136 |
9 | 530145 |
10 | 11116800 |
11 | 68139225 |
12 | 1644364800 |
13 | 12034447425 |
14 | 329001523200 |
15 | 2801155982625 |
16 | 85619242598400 |
17 | 831764543234625 |
18 | 28117244819865600 |
19 | 307025061241523625 |
20 | 11374945402060800000 |
[2,3,40,105,1584,5985,107136,530145,11116800, 68139225,1644364800,12034447425,329001523200, 2801155982625,85619242598400,831764543234625, 28117244819865600,307025061241523625, 11374945402060800000] |