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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 891 |
| 9 | 18041 |
| 10 | 337085 |
| 11 | 6076989 |
| 12 | 108331202 |
| 13 | 1937745128 |
| 14 | 35104098525 |
| 15 | 648090669839 |
[1,37,891,18041,337085,6076989,108331202, 1937745128,35104098525,648090669839] |