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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 15 |
| 4 | 7 |
| 5 | 341 |
| 6 | 819 |
| 7 | 255 |
| 8 | 9709 |
| 9 | 2047 |
| 10 | 475107 |
| 11 | 31 |
| 12 | 9699291 |
| 13 | 41943 |
| 14 | 5461 |
| 15 | 8388607 |
| 16 | 3556769739 |
| 17 | 31675383749 |
| 18 | 65498251203 |
| 19 | 575525617597 |
| 20 | 34359738367 |
| 21 | 511 |
| 22 | 549755813887 |
| 23 | 182518930210733 |
| 24 | 2047 |
| 25 | 1627389855 |
| 26 | 113715890591104923 |
| 27 | 2251799813685247 |
| 28 | 963770320257286037 |
[3,15,7,341,819,255,9709,2047,475107,31,9699291, 41943,5461,8388607,3556769739,31675383749, 65498251203,575525617597,34359738367,511, 549755813887,182518930210733,2047,1627389855, 113715890591104923,2251799813685247, 963770320257286037] |