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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 23 |
| 8 | 382 |
| 9 | 5780 |
| 10 | 86029 |
| 11 | 1301673 |
| 12 | 20338679 |
| 13 | 330737236 |
| 14 | 5618265376 |
| 15 | 99849949772 |
| 16 | 1857170751804 |
| 17 | 36135886878072 |
| 18 | 734947859916792 |
| 19 | 15608257104179952 |
| 20 | 345724111468700496 |
| 21 | 7977315239656638912 |
| 22 | 191516062334747746752 |
| 23 | 4778050475554642998144 |
| 24 | 123731984754223222096512 |
[1,23,382,5780,86029,1301673,20338679,330737236, 5618265376,99849949772,1857170751804, 36135886878072,734947859916792,15608257104179952, 345724111468700496,7977315239656638912, 191516062334747746752,4778050475554642998144, 123731984754223222096512] |