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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 7 |
| 4 | 19 |
| 5 | 71 |
| 6 | 97 |
| 7 | 3691 |
| 8 | 191861 |
| 9 | 138907099 |
| 10 | 708158977 |
| 11 | 26947261171 |
[2,5,7,19,71,97,3691,191861,138907099,708158977, 26947261171] |