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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 52 |
| 10 | 193 |
| 11 | 781 |
| 12 | 3781 |
| 13 | 20901 |
| 14 | 131341 |
| 15 | 1017012 |
| 16 | 9065243 |
| 17 | 91925870 |
[1,7,19,52,193,781,3781,20901,131341,1017012, 9065243,91925870] |