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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 27 |
| 7 | 5837 |
| 8 | 2129410576 |
| 9 | 17850077316687753782569 |
| 10 | 2346851008195218976646246398770505953580095510848345967 |
[1,1,1,1,2,5,27,5837,2129410576, 17850077316687753782569, 23468510081952189766462463987705059535800955108483\ 45967] |