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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 24 |
| 9 | 351 |
| 10 | 4060 |
| 11 | 40920 |
| 12 | 376992 |
| 13 | 3262623 |
| 14 | 26978328 |
| 15 | 215553195 |
| 16 | 1677106640 |
| 17 | 12777711870 |
| 18 | 95722852680 |
| 19 | 707285522580 |
| 20 | 5166863427600 |
| 21 | 37387265592825 |
| 22 | 268367258592576 |
| 23 | 1913212193400684 |
| 24 | 13559593014190944 |
[1,24,351,4060,40920,376992,3262623,26978328, 215553195,1677106640,12777711870,95722852680, 707285522580,5166863427600,37387265592825, 268367258592576,1913212193400684, 13559593014190944] |