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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 7 |
| 4 | 19 |
| 5 | 13 |
| 6 | 71 |
| 7 | 97 |
| 8 | 181 |
| 9 | 3691 |
| 10 | 2521 |
| 11 | 191861 |
| 12 | 489061 |
| 13 | 6811741 |
| 14 | 138907099 |
| 15 | 708158977 |
| 16 | 1321442641 |
| 17 | 26947261171 |
| 18 | 18405321661 |
| 19 | 381765135195632792959100810331957408101589361 |
[2,5,7,19,13,71,97,181,3691,2521,191861,489061, 6811741,138907099,708158977,1321442641, 26947261171,18405321661, 381765135195632792959100810331957408101589361] |