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| n | a(n) |
|---|---|
| 1 | 55 |
| 2 | 23527 |
| 3 | 18914231 |
| 4 | 11903604235 |
| 5 | 6715679348165 |
| 6 | 3637116511064523 |
[55,23527,18914231,11903604235,6715679348165, 3637116511064523] |