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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 47 |
| 6 | 97 |
| 7 | 197 |
| 8 | 397 |
| 9 | 797 |
| 10 | 1597 |
| 11 | 3203 |
| 12 | 6421 |
| 13 | 12889 |
| 14 | 25841 |
| 15 | 51749 |
| 16 | 103567 |
| 17 | 207227 |
| 18 | 414553 |
| 19 | 829211 |
| 20 | 1658533 |
| 21 | 3317177 |
| 22 | 6634469 |
| 23 | 13269059 |
| 24 | 26538257 |
| 25 | 53076679 |
| 26 | 106153547 |
| 27 | 212307299 |
| 28 | 424614829 |
| 29 | 849229907 |
| 30 | 1698460067 |
| 31 | 3396920419 |
[2,5,11,23,47,97,197,397,797,1597,3203,6421,12889, 25841,51749,103567,207227,414553,829211,1658533, 3317177,6634469,13269059,26538257,53076679, 106153547,212307299,424614829,849229907, 1698460067,3396920419] |