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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 315 |
| 5 | 108675 |
| 6 | 11878720875 |
| 7 | 141106591466142946875 |
| 8 | 19911070158545297149037891328865229296875 |
| 9 | 396450714858513044552818188364610837019719636049876979456842033610756600341796875 |
[1,1,3,15,315,108675,11878720875, 141106591466142946875, 19911070158545297149037891328865229296875, 39645071485851304455281818836461083701971963604987\ 6979456842033610756600341796875] |