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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 894 |
| 9 | 18209 |
| 10 | 342746 |
| 11 | 6227216 |
| 12 | 111809573 |
| 13 | 2011739254 |
| 14 | 36593905375 |
| 15 | 677012700022 |
[1,37,894,18209,342746,6227216,111809573, 2011739254,36593905375,677012700022] |