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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 80 |
| 4 | 11360 |
| 5 | 1508032 |
| 6 | 197163648 |
| 7 | 27624399104 |
| 8 | 4256968553472 |
| 9 | 724948555548672 |
| 10 | 136034167652859904 |
| 11 | 27976811931437752320 |
| 12 | 6269253131872946298880 |
| 13 | 1522110257603797873737728 |
| 14 | 398311795891656532955725824 |
| 15 | 111813044381693547723191418880 |
[1,0,0,80,11360,1508032,197163648,27624399104, 4256968553472,724948555548672,136034167652859904, 27976811931437752320,6269253131872946298880, 1522110257603797873737728, 398311795891656532955725824, 111813044381693547723191418880] |