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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 40 |
| 4 | 1495 |
| 5 | 121531 |
| 6 | 18378156 |
| 7 | 4652937374 |
| 8 | 1829296447951 |
| 9 | 1055739103757707 |
| 10 | 856324097763583103 |
| 11 | 942899788013465664526 |
| 12 | 1370120155860850464287332 |
| 13 | 2566350356948078165376399996 |
| 14 | 6074750319819847117120345095156 |
| 15 | 17866277583553806453770008420577710 |
[1,1,3,40,1495,121531,18378156,4652937374, 1829296447951,1055739103757707,856324097763583103, 942899788013465664526,1370120155860850464287332, 2566350356948078165376399996, 6074750319819847117120345095156, 17866277583553806453770008420577710] |