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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 108 |
| 5 | 25200 |
| 6 | 6566400 |
| 7 | 2263917600 |
| 8 | 1070863718400 |
| 9 | 695561049469440 |
| 10 | 612326076235776000 |
| 11 | 716999439503394432000 |
| 12 | 1094463733944478334976000 |
| 13 | 2136344904330981293005056000 |
| 14 | 5240068882948994816402679398400 |
| 15 | 15901807526128013295439617984000000 |
| 16 | 58888414506334327924778872791367680000 |
| 17 | 262906951354695579633857525111586324480000 |
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