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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 15 |
| 9 | 26 |
| 10 | 50 |
| 11 | 90 |
| 12 | 169 |
| 13 | 310 |
| 14 | 583 |
| 15 | 1082 |
| 16 | 2047 |
| 17 | 3837 |
| 18 | 7279 |
| 19 | 13769 |
| 20 | 26209 |
| 21 | 49878 |
| 22 | 95324 |
| 23 | 182260 |
| 24 | 349518 |
| 25 | 670918 |
| 26 | 1290539 |
| 27 | 2485189 |
| 28 | 4793489 |
| 29 | 9255782 |
| 30 | 17895678 |
| 31 | 34635742 |
| 32 | 67108813 |
| 33 | 130148445 |
| 34 | 252645129 |
| 35 | 490849458 |
[1,0,0,0,1,2,4,8,15,26,50,90,169,310,583,1082, 2047,3837,7279,13769,26209,49878,95324,182260, 349518,670918,1290539,2485189,4793489,9255782, 17895678,34635742,67108813,130148445,252645129, 490849458] |