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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 81 |
| 4 | 729 |
| 5 | 631881 |
| 6 | 5427972729 |
| 7 | 45361863816318631881 |
| 8 | 36452754972542772954279725427972729 |
| 9 | 2754364518634536816318453618636318814536186381631845361863816318631881 |
[1,9,81,729,631881,5427972729, 45361863816318631881, 36452754972542772954279725427972729, 27543645186345368163184536186363188145361863816318\ 45361863816318631881] |