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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 7 |
| 10 | 14 |
| 11 | 28 |
| 12 | 56 |
| 13 | 111 |
| 14 | 220 |
| 15 | 436 |
| 16 | 865 |
| 17 | 1716 |
| 18 | 3404 |
| 19 | 6752 |
| 20 | 13393 |
| 21 | 26566 |
| 22 | 52696 |
| 23 | 104527 |
| 24 | 207338 |
| 25 | 411272 |
| 26 | 815792 |
| 27 | 1618191 |
| 28 | 3209816 |
| 29 | 6366936 |
| 30 | 12629345 |
| 31 | 25051352 |
| 32 | 49691432 |
| 33 | 98567072 |
| 34 | 195515953 |
| 35 | 387822090 |
| 36 | 769277244 |
| 37 | 1525925143 |
| 38 | 3026798934 |
[0,0,1,0,0,0,1,2,4,7,14,28,56,111,220,436,865, 1716,3404,6752,13393,26566,52696,104527,207338, 411272,815792,1618191,3209816,6366936,12629345, 25051352,49691432,98567072,195515953,387822090, 769277244,1525925143,3026798934] |