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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 477 |
| 3 | 70818 |
| 4 | 2208159610 |
| 5 | 445557105328 |
| 6 | 19185898282602827 |
| 7 | 905428099582719818595 |
[1,6,477,70818,2208159610,445557105328, 19185898282602827,905428099582719818595] |