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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 850 |
| 7 | 624750 |
| 8 | 4228932750 |
| 9 | 284539511151000 |
| 10 | 205915553429755680000 |
| 11 | 1731646846567530390960000000 |
| 12 | 182269815381165453023977392960000000 |
| 13 | 257732232581979345367168654620866388480000000 |
| 14 | 5235508937551175000760375514558779305187938734080000000 |
| 15 | 1628187052306629700637438618898904208447222949912051474432000000000 |
[1,10,850,624750,4228932750,284539511151000, 205915553429755680000, 1731646846567530390960000000, 182269815381165453023977392960000000, 257732232581979345367168654620866388480000000, 52355089375511750007603755145587793051879387340800\ 00000, 16281870523066297006374386188989042084472229499120\ 51474432000000000] |