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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 27 |
| 4 | 17 |
| 5 | 1089 |
| 6 | 4225 |
| 7 | 16641 |
| 8 | 257 |
| 9 | 69257922561 |
| 10 | 1076890625 |
| 11 | 4198401 |
| 12 | 16785409 |
| 13 | 67125249 |
| 14 | 72075187834650625 |
| 15 | 1238166730171084290520186881 |
| 16 | 65537 |
| 17 | 17180131329 |
| 18 | 22301425772351053845871360015696103812890625 |
| 19 | 274878955521 |
[3,5,27,17,1089,4225,16641,257,69257922561, 1076890625,4198401,16785409,67125249, 72075187834650625,1238166730171084290520186881, 65537,17180131329, 22301425772351053845871360015696103812890625, 274878955521] |