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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 2187 |
| 4 | 59049 |
| 5 | 177147 |
| 6 | 1594323 |
| 7 | 14348907 |
| 8 | 43046721 |
| 9 | 1162261467 |
| 10 | 3486784401 |
| 11 | 31381059609 |
| 12 | 22876792454961 |
| 13 | 68630377364883 |
| 14 | 205891132094649 |
| 15 | 16677181699666569 |
| 16 | 150094635296999121 |
| 17 | 36472996377170786403 |
| 18 | 328256967394537077627 |
| 19 | 8862938119652501095929 |
| 20 | 79766443076872509863361 |
[1,81,2187,59049,177147,1594323,14348907,43046721, 1162261467,3486784401,31381059609,22876792454961, 68630377364883,205891132094649,16677181699666569, 150094635296999121,36472996377170786403, 328256967394537077627,8862938119652501095929, 79766443076872509863361] |