The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 16 |
| 5 | 65 |
| 6 | 66 |
| 7 | 427 |
| 8 | 848 |
| 9 | 2529 |
| 10 | 2530 |
| 11 | 27731 |
| 12 | 27732 |
| 13 | 360373 |
| 14 | 360374 |
| 15 | 360375 |
| 16 | 720736 |
| 17 | 12252257 |
| 18 | 12252258 |
| 19 | 232792579 |
| 20 | 232792580 |
| 21 | 232792581 |
| 22 | 232792582 |
| 23 | 5354228903 |
| 24 | 5354228904 |
| 25 | 26771144425 |
| 26 | 26771144426 |
| 27 | 80313433227 |
| 28 | 80313433228 |
| 29 | 2329089562829 |
| 30 | 2329089562830 |
[2,4,9,16,65,66,427,848,2529,2530,27731,27732, 360373,360374,360375,720736,12252257,12252258, 232792579,232792580,232792581,232792582, 5354228903,5354228904,26771144425,26771144426, 80313433227,80313433228,2329089562829, 2329089562830] |