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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 648 |
| 3 | 10539 |
| 4 | 149346 |
| 5 | 1938780 |
| 6 | 23903442 |
| 7 | 284222502 |
| 8 | 3292100235 |
| 9 | 37420852599 |
[1,27,648,10539,149346,1938780,23903442,284222502, 3292100235,37420852599] |