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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 895 |
| 9 | 18264 |
| 10 | 344552 |
| 11 | 6273839 |
| 12 | 112860681 |
| 13 | 2033546940 |
| 14 | 37022777899 |
| 15 | 685152216140 |
[1,37,895,18264,344552,6273839,112860681, 2033546940,37022777899,685152216140] |