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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9694845 |
| 3 | 3343436236585914480 |
| 4 | 64804916367088484487100154177496 |
| 5 | 161780768091373089273770663805075564895813872000 |
[1,9694845,3343436236585914480, 64804916367088484487100154177496, 161780768091373089273770663805075564895813872000] |