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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 5 |
| 6 | 12 |
| 7 | 23 |
| 8 | 52 |
| 9 | 105 |
| 10 | 232 |
| 11 | 480 |
| 12 | 1049 |
| 13 | 2199 |
| 14 | 4777 |
| 15 | 10092 |
| 16 | 21845 |
| 17 | 46377 |
| 18 | 100159 |
| 19 | 213328 |
| 20 | 460023 |
| 21 | 981976 |
| 22 | 2115350 |
| 23 | 4522529 |
| 24 | 9735205 |
| 25 | 20836827 |
| 26 | 44829766 |
| 27 | 96030613 |
| 28 | 206526972 |
| 29 | 442675064 |
| 30 | 951759621 |
| 31 | 2040962281 |
| 32 | 4387156587 |
| 33 | 9411145925 |
| 34 | 20226421380 |
[1,0,1,1,3,5,12,23,52,105,232,480,1049,2199,4777, 10092,21845,46377,100159,213328,460023,981976, 2115350,4522529,9735205,20836827,44829766, 96030613,206526972,442675064,951759621,2040962281, 4387156587,9411145925,20226421380] |