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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 27 |
| 4 | 242 |
| 5 | 1904 |
| 6 | 8593 |
| 7 | 59395 |
| 8 | 330625 |
| 9 | 1878470 |
| 10 | 11243393 |
| 11 | 68055184 |
| 12 | 407535370 |
| 13 | 2426988031 |
| 14 | 14447481171 |
| 15 | 86405786370 |
| 16 | 514988469806 |
| 17 | 3074520903444 |
| 18 | 18359513091808 |
| 19 | 109588403253082 |
| 20 | 654079304825368 |
| 21 | 3904370864134171 |
[0,8,27,242,1904,8593,59395,330625,1878470, 11243393,68055184,407535370,2426988031, 14447481171,86405786370,514988469806, 3074520903444,18359513091808,109588403253082, 654079304825368,3904370864134171] |