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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 19 |
| 3 | 137 |
| 4 | 1289 |
| 5 | 4975049 |
| 6 | 19374829215705183817985416854342477445596764166957007 |
[3,19,137,1289,4975049, 19374829215705183817985416854342477445596764166957\ 007] |