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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 9841 |
| 3 | 3812798742493 |
| 4 | 221713244121518884974124815309574946401 |
[1,13,9841,3812798742493, 221713244121518884974124815309574946401] |