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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 36 |
| 4 | 2555 |
| 5 | 335655 |
| 6 | 74550304 |
| 7 | 26015028256 |
| 8 | 13472453691584 |
| 9 | 9899759488178880 |
| 10 | 9956935441072958976 |
| 11 | 13309904809688027245056 |
| 12 | 23075728090638862938144768 |
| 13 | 50829133553976135556548919296 |
| 14 | 139764726764087926884028696756224 |
| 15 | 472500813583621452881213310763008000 |
[0,0,1,36,2555,335655,74550304,26015028256, 13472453691584,9899759488178880, 9956935441072958976,13309904809688027245056, 23075728090638862938144768, 50829133553976135556548919296, 139764726764087926884028696756224, 472500813583621452881213310763008000] |