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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 12 |
| 6 | 31 |
| 7 | 73 |
| 8 | 165 |
| 9 | 357 |
| 10 | 760 |
| 11 | 1582 |
| 12 | 3270 |
| 13 | 6678 |
| 14 | 13589 |
| 15 | 27482 |
| 16 | 55468 |
| 17 | 111588 |
| 18 | 224259 |
| 19 | 449908 |
| 20 | 902106 |
| 21 | 1807173 |
| 22 | 3619162 |
| 23 | 7244557 |
| 24 | 14499238 |
| 25 | 29011551 |
| 26 | 58044194 |
| 27 | 116115782 |
| 28 | 232275383 |
| 29 | 464607730 |
| 30 | 929306306 |
| 31 | 1858730674 |
| 32 | 3717648658 |
| 33 | 7435541392 |
| 34 | 14871467784 |
[1,4,12,31,73,165,357,760,1582,3270,6678,13589, 27482,55468,111588,224259,449908,902106,1807173, 3619162,7244557,14499238,29011551,58044194, 116115782,232275383,464607730,929306306, 1858730674,3717648658,7435541392,14871467784] |