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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 894 |
| 9 | 18213 |
| 10 | 342987 |
| 11 | 6235874 |
| 12 | 112052824 |
| 13 | 2017665690 |
| 14 | 36725776559 |
[1,37,894,18213,342987,6235874,112052824, 2017665690,36725776559] |