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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 288 |
| 3 | 7200 |
| 4 | 156800 |
| 5 | 3175200 |
| 6 | 61471872 |
| 7 | 1154305152 |
| 8 | 21201523200 |
| 9 | 382952512800 |
| 10 | 6826955907200 |
| 11 | 120427502203008 |
| 12 | 2105988385632768 |
| 13 | 36562298361680000 |
| 14 | 630861905459520000 |
| 15 | 10827650254927680000 |
| 16 | 184984389244186675200 |
[0,8,288,7200,156800,3175200,61471872,1154305152, 21201523200,382952512800,6826955907200, 120427502203008,2105988385632768, 36562298361680000,630861905459520000, 10827650254927680000,184984389244186675200] |