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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 43 |
| 10 | 239 |
| 11 | 1041 |
| 12 | 3863 |
| 13 | 18481 |
| 14 | 111137 |
| 15 | 720077 |
| 16 | 5291974 |
| 17 | 48305684 |
[1,7,19,43,239,1041,3863,18481,111137,720077, 5291974,48305684] |