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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 288 |
| 4 | 3267 |
| 5 | 38232 |
| 6 | 456030 |
| 7 | 5511726 |
| 8 | 67275765 |
| 9 | 827544276 |
| 10 | 10243778238 |
| 11 | 127471232682 |
| 12 | 1593323199828 |
| 13 | 19992464465031 |
| 14 | 251700257824749 |
| 15 | 3178185350410386 |
| 16 | 40235213754593325 |
| 17 | 510553935341621550 |
| 18 | 6492029680359751572 |
| 19 | 82705296277037467728 |
| 20 | 1055413999621027732986 |
[1,3,27,288,3267,38232,456030,5511726,67275765, 827544276,10243778238,127471232682,1593323199828, 19992464465031,251700257824749,3178185350410386, 40235213754593325,510553935341621550, 6492029680359751572,82705296277037467728, 1055413999621027732986] |