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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 78 |
| 5 | 657 |
| 6 | 5448 |
| 7 | 49869 |
| 8 | 520416 |
| 9 | 5901138 |
| 10 | 70092000 |
| 11 | 902850273 |
| 12 | 12416814432 |
| 13 | 183763314090 |
| 14 | 2854581512832 |
[1,9,78,657,5448,49869,520416,5901138,70092000, 902850273,12416814432,183763314090,2854581512832] |