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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 38 |
| 5 | 644 |
| 6 | 11258 |
| 7 | 477591 |
| 8 | 38645905 |
| 9 | 5336450490 |
| 10 | 1462784939541 |
[1,2,8,38,644,11258,477591,38645905,5336450490, 1462784939541] |