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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1928 |
| 3 | 38240 |
| 4 | 781467 |
| 5 | 15009944 |
| 6 | 270547199 |
| 7 | 4578333280 |
| 8 | 72152875243 |
[81,1928,38240,781467,15009944,270547199, 4578333280,72152875243] |