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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 32 |
| 4 | 391 |
| 5 | 6462 |
| 6 | 134974 |
| 7 | 3412187 |
| 8 | 101323674 |
| 9 | 3457536144 |
| 10 | 133333945461 |
| 11 | 5734792007584 |
| 12 | 272197255745078 |
| 13 | 14133109419794601 |
| 14 | 796883164532719216 |
| 15 | 48489515568651113516 |
| 16 | 3167153388603620859695 |
| 17 | 221021628292403019655418 |
[1,1,4,32,391,6462,134974,3412187,101323674, 3457536144,133333945461,5734792007584, 272197255745078,14133109419794601, 796883164532719216,48489515568651113516, 3167153388603620859695,221021628292403019655418] |