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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 6561 |
| 3 | 151580 |
| 4 | 1560013 |
| 5 | 11012718 |
| 6 | 61333566 |
| 7 | 288823579 |
| 8 | 1196519547 |
| 9 | 4468789562 |
| 10 | 15293854291 |
| 11 | 48524120300 |
| 12 | 143996244303 |
| 13 | 402491787780 |
| 14 | 1065874328092 |
| 15 | 2687501352957 |
| 16 | 6479586585575 |
| 17 | 14994608609716 |
| 18 | 33416226803133 |
[81,6561,151580,1560013,11012718,61333566, 288823579,1196519547,4468789562,15293854291, 48524120300,143996244303,402491787780, 1065874328092,2687501352957,6479586585575, 14994608609716,33416226803133] |