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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 639 |
| 3 | 6879 |
| 4 | 127113 |
| 5 | 3413516 |
| 6 | 173486981 |
| 7 | 12274465993 |
| 8 | 2038592272997 |
| 9 | 393572287740663 |
[81,639,6879,127113,3413516,173486981,12274465993, 2038592272997,393572287740663] |