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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 17 |
| 3 | 257 |
| 4 | 65537 |
| 5 | 185302018885184100000000000000000000000000000001 |
[3,5,17,257,65537, 185302018885184100000000000000000000000000000001] |