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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 142 |
| 4 | 5157 |
| 5 | 392393 |
| 6 | 67247490 |
| 7 | 25956605294 |
| 8 | 22069906835089 |
| 9 | 42518510891269917 |
[1,8,142,5157,392393,67247490,25956605294, 22069906835089,42518510891269917] |