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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 117 |
| 5 | 2250 |
| 6 | 107352 |
| 7 | 12298500 |
| 8 | 3613136949 |
| 9 | 2742962912055 |
| 10 | 5503085134707267 |
| 11 | 29497134965411187747 |
| 12 | 427365985177386403469028 |
| 13 | 16883252883454411208147060304 |
| 14 | 1832920589508888783152391724736550 |
[1,1,3,12,117,2250,107352,12298500,3613136949, 2742962912055,5503085134707267, 29497134965411187747,427365985177386403469028, 16883252883454411208147060304, 1832920589508888783152391724736550] |