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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1632 |
| 3 | 53167 |
| 4 | 3604930 |
| 5 | 480758688 |
| 6 | 101410470742 |
| 7 | 36546653191142 |
| 8 | 26246859602932048 |
[81,1632,53167,3604930,480758688,101410470742, 36546653191142,26246859602932048] |