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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 19 |
| 3 | 41 |
| 4 | 83 |
| 5 | 167 |
| 6 | 337 |
| 7 | 673 |
| 8 | 1361 |
| 9 | 2729 |
| 10 | 5471 |
| 11 | 10949 |
| 12 | 21911 |
| 13 | 43853 |
| 14 | 87719 |
| 15 | 175447 |
| 16 | 350899 |
| 17 | 701819 |
| 18 | 1403641 |
| 19 | 2807303 |
| 20 | 5614657 |
| 21 | 11229331 |
| 22 | 22458671 |
| 23 | 44917381 |
| 24 | 89834777 |
| 25 | 179669557 |
| 26 | 359339171 |
| 27 | 718678369 |
[15,19,41,83,167,337,673,1361,2729,5471,10949, 21911,43853,87719,175447,350899,701819,1403641, 2807303,5614657,11229331,22458671,44917381, 89834777,179669557,359339171,718678369] |