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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 13 |
| 4 | 61 |
| 5 | 1021 |
| 6 | 65521 |
| 7 | 68719476731 |
| 8 | 1427247692705959881058285969449495136382746621 |
[2,3,13,61,1021,65521,68719476731, 1427247692705959881058285969449495136382746621] |