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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 52 |
| 10 | 178 |
| 11 | 691 |
| 12 | 3685 |
| 13 | 20423 |
| 14 | 128624 |
| 15 | 1025960 |
| 16 | 9573074 |
| 17 | 102844369 |
[1,7,19,52,178,691,3685,20423,128624,1025960, 9573074,102844369] |