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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 88 |
| 4 | 25421 |
| 5 | 2077323118 |
| 6 | 9221293242272922067 |
| 7 | 170141182628636920942528022609657505092 |
[1,2,7,88,25421,2077323118,9221293242272922067, 170141182628636920942528022609657505092] |