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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 88 |
| 4 | 2304 |
| 5 | 95440 |
| 6 | 5730914 |
| 7 | 471168554 |
| 8 | 50843909070 |
| 9 | 6973120310921 |
| 10 | 1184918837271686 |
[1,6,88,2304,95440,5730914,471168554,50843909070, 6973120310921,1184918837271686] |