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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 720 |
| 7 | 3110940 |
| 8 | 24046189440 |
| 9 | 315031400802720 |
| 10 | 6736218287430460752 |
| 11 | 226885231700215713535680 |
| 12 | 11649337108041078980732943360 |
| 13 | 885282776210120715086715619724160 |
| 14 | 96986285294151066094112970262797953280 |
[1,720,3110940,24046189440,315031400802720, 6736218287430460752,226885231700215713535680, 11649337108041078980732943360, 885282776210120715086715619724160, 96986285294151066094112970262797953280] |