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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 182 |
| 11 | 814 |
| 12 | 3007 |
| 13 | 16060 |
| 14 | 115416 |
| 15 | 773749 |
| 16 | 6226900 |
| 17 | 66290928 |
| 18 | 740922136 |
[1,7,19,37,182,814,3007,16060,115416,773749, 6226900,66290928,740922136] |