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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 0 |
| 4 | 96 |
| 5 | 384 |
| 6 | 12 |
| 7 | 3456 |
| 8 | 460800 |
| 9 | 236160 |
| 10 | 96 |
| 11 | 168960 |
| 12 | 3065610240 |
| 13 | 125962905600 |
| 14 | 764467200 |
| 15 | 3120 |
| 16 | 12211200 |
| 17 | 51115799347200 |
| 18 | 453840358706380800 |
| 19 | 226918953109094400 |
| 20 | 6383697868800 |
| 21 | 115200 |
| 22 | 1196052480 |
| 23 | 1816224465420288000 |
| 24 | 6896429934345052028928000 |
[0,8,0,96,384,12,3456,460800,236160,96,168960, 3065610240,125962905600,764467200,3120,12211200, 51115799347200,453840358706380800, 226918953109094400,6383697868800,115200, 1196052480,1816224465420288000, 6896429934345052028928000] |