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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 729 |
| 3 | 531441 |
| 4 | 2503155504993241601315571986085849 |
| 5 | 4638397686588101979328150167890591454318967698009 |
[9,729,531441,2503155504993241601315571986085849, 4638397686588101979328150167890591454318967698009] |