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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1536 |
| 3 | 44828 |
| 4 | 2161168 |
| 5 | 159014170 |
| 6 | 18615658788 |
| 7 | 3615152813462 |
| 8 | 1107896271684848 |
[81,1536,44828,2161168,159014170,18615658788, 3615152813462,1107896271684848] |