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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 40 |
| 3 | 61 |
| 4 | 103 |
| 5 | 181 |
| 6 | 337 |
| 7 | 637 |
| 8 | 1237 |
| 9 | 2413 |
| 10 | 4765 |
| 11 | 9421 |
| 12 | 18733 |
| 13 | 37261 |
| 14 | 74317 |
| 15 | 148237 |
| 16 | 296077 |
| 17 | 591373 |
| 18 | 1181965 |
| 19 | 2362381 |
| 20 | 4723213 |
| 21 | 9443341 |
| 22 | 18883597 |
| 23 | 37761037 |
| 24 | 75515917 |
| 25 | 151019533 |
| 26 | 302026765 |
| 27 | 604028941 |
| 28 | 1208033293 |
| 29 | 2416017421 |
| 30 | 4831985677 |
[28,40,61,103,181,337,637,1237,2413,4765,9421, 18733,37261,74317,148237,296077,591373,1181965, 2362381,4723213,9443341,18883597,37761037, 75515917,151019533,302026765,604028941,1208033293, 2416017421,4831985677] |