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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 387420489 |
| 4 | 3486784401 |
| 5 | 7509466514979724803946715958257547 |
| 6 | 147808829414345923316083210206383297601 |
[9,81,387420489,3486784401, 7509466514979724803946715958257547, 147808829414345923316083210206383297601] |