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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 43 |
| 8 | 785 |
| 9 | 14065 |
| 10 | 234646 |
| 11 | 3890624 |
| 12 | 65790726 |
| 13 | 1149152226 |
| 14 | 20755593249 |
| 15 | 389723127653 |
| 16 | 7616467493381 |
| 17 | 155034653456005 |
| 18 | 3285524611730078 |
| 19 | 72467273447829602 |
| 20 | 1661985062849397148 |
| 21 | 39610017536621076924 |
| 22 | 979981089604037392299 |
| 23 | 25145506663601266049403 |
[1,43,785,14065,234646,3890624,65790726, 1149152226,20755593249,389723127653,7616467493381, 155034653456005,3285524611730078, 72467273447829602,1661985062849397148, 39610017536621076924,979981089604037392299, 25145506663601266049403] |