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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 9 |
| 6 | 22 |
| 7 | 31 |
| 8 | 61 |
| 9 | 121 |
| 10 | 247 |
| 11 | 479 |
| 12 | 951 |
| 13 | 1862 |
| 14 | 3802 |
| 15 | 7431 |
| 16 | 15180 |
| 17 | 29723 |
| 18 | 59766 |
| 19 | 118893 |
| 20 | 239999 |
| 21 | 475573 |
| 22 | 959341 |
| 23 | 1902293 |
| 24 | 3835229 |
| 25 | 7609175 |
| 26 | 15268473 |
| 27 | 30436701 |
| 28 | 61001391 |
[1,2,3,5,9,22,31,61,121,247,479,951,1862,3802, 7431,15180,29723,59766,118893,239999,475573, 959341,1902293,3835229,7609175,15268473,30436701, 61001391] |