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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 5 |
| 7 | 9 |
| 8 | 13 |
| 9 | 35 |
| 10 | 51 |
| 11 | 93 |
| 12 | 175 |
| 13 | 331 |
| 14 | 595 |
| 15 | 1149 |
| 16 | 2182 |
| 17 | 4097 |
| 18 | 7749 |
| 19 | 14780 |
| 20 | 28131 |
| 21 | 53583 |
| 22 | 102372 |
| 23 | 196345 |
| 24 | 375876 |
| 25 | 722743 |
| 26 | 1392156 |
| 27 | 2684022 |
| 28 | 5180823 |
| 29 | 10008419 |
| 30 | 19368226 |
| 31 | 37499404 |
| 32 | 72698062 |
| 33 | 141064116 |
[0,2,1,2,2,5,9,13,35,51,93,175,331,595,1149,2182, 4097,7749,14780,28131,53583,102372,196345,375876, 722743,1392156,2684022,5180823,10008419,19368226, 37499404,72698062,141064116] |