n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 24 |
5 | 96 |
6 | 1080 |
7 | 6480 |
8 | 80640 |
9 | 645120 |
10 | 9072000 |
11 | 90720000 |
12 | 1437004800 |
13 | 17244057600 |
14 | 305124019200 |
15 | 4271736268800 |
16 | 83691159552000 |
17 | 1339058552832000 |
18 | 28810681675776000 |
19 | 518592270163968000 |
20 | 12164510040883200000 |
[0,1,2,24,96,1080,6480,80640,645120,9072000, 90720000,1437004800,17244057600,305124019200, 4271736268800,83691159552000,1339058552832000, 28810681675776000,518592270163968000, 12164510040883200000] |