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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 17 |
| 4 | 26 |
| 5 | 171 |
| 6 | 257 |
| 7 | 265 |
| 8 | 1921 |
| 9 | 9385 |
| 10 | 26665 |
| 11 | 65537 |
| 12 | 263041 |
| 13 | 437761 |
| 14 | 1057801 |
| 15 | 2038648321 |
| 16 | 10866583226 |
| 17 | 11453097097 |
| 18 | 982923711145 |
[3,5,17,26,171,257,265,1921,9385,26665,65537, 263041,437761,1057801,2038648321,10866583226, 11453097097,982923711145] |