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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 82 |
| 11 | 304 |
| 12 | 1597 |
| 13 | 8409 |
| 14 | 37756 |
| 15 | 200483 |
| 16 | 1450289 |
| 17 | 12807392 |
| 18 | 119527765 |
| 19 | 1178177160 |
[1,7,19,37,82,304,1597,8409,37756,200483,1450289, 12807392,119527765,1178177160] |