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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 868 |
| 4 | 135766 |
| 5 | 821135900 |
| 6 | 5427557363908 |
| 7 | 486439997897622259 |
| 8 | 105891766683961733641397 |
[1,2,868,135766,821135900,5427557363908, 486439997897622259,105891766683961733641397] |