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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 268 |
| 4 | 195472 |
| 5 | 104310534400 |
| 6 | 29722161121961969778688 |
| 7 | 2413441860555924454205324333893477339897004032 |
| 8 | 15913289476042091181119569948276231488639535067163704670852319029791565485433738366445158400 |
[1,2,10,268,195472,104310534400, 29722161121961969778688, 2413441860555924454205324333893477339897004032, 15913289476042091181119569948276231488639535067163\ 704670852319029791565485433738366445158400] |