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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 21 |
| 5 | 43 |
| 6 | 85 |
| 7 | 171 |
| 8 | 341 |
| 9 | 683 |
| 10 | 1365 |
| 11 | 2987 |
| 12 | 5973 |
| 13 | 11435 |
| 14 | 24405 |
| 15 | 48555 |
| 16 | 97621 |
| 17 | 196267 |
| 18 | 392533 |
| 19 | 785323 |
| 20 | 1571413 |
| 21 | 3141547 |
| 22 | 6291029 |
| 23 | 12581803 |
| 24 | 25164629 |
| 25 | 50331307 |
| 26 | 100662613 |
| 27 | 201325483 |
| 28 | 402651733 |
| 29 | 805302187 |
| 30 | 1610612309 |
| 31 | 3221224363 |
| 32 | 6442449749 |
| 33 | 12884901547 |
[1,3,5,11,21,43,85,171,341,683,1365,2987,5973, 11435,24405,48555,97621,196267,392533,785323, 1571413,3141547,6291029,12581803,25164629, 50331307,100662613,201325483,402651733,805302187, 1610612309,3221224363,6442449749,12884901547] |