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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 892 |
| 9 | 18097 |
| 10 | 339000 |
| 11 | 6129010 |
| 12 | 109570327 |
| 13 | 1964936896 |
| 14 | 35669679012 |
| 15 | 659440950724 |
[1,37,892,18097,339000,6129010,109570327, 1964936896,35669679012,659440950724] |