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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 113 |
| 4 | 3492 |
| 5 | 183732 |
| 6 | 17061118 |
| 7 | 7743056064 |
| 8 | 148195347518186 |
| 9 | 38447365355811944462 |
[1,1,8,113,3492,183732,17061118,7743056064, 148195347518186,38447365355811944462] |