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| n | a(n) |
|---|---|
| 1 | 53 |
| 2 | 31541 |
| 3 | 209636605 |
| 4 | 15624102535570 |
| 5 | 13038188765075658693 |
| 6 | 121880956287359200992546463 |
[53,31541,209636605,15624102535570, 13038188765075658693,121880956287359200992546463] |