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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 67 |
| 11 | 219 |
| 12 | 1086 |
| 13 | 6381 |
| 14 | 31966 |
| 15 | 154641 |
| 16 | 952314 |
| 17 | 7600004 |
| 18 | 73667522 |
| 19 | 781898311 |
| 20 | 8779500403 |
[1,7,19,37,67,219,1086,6381,31966,154641,952314, 7600004,73667522,781898311,8779500403] |