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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 2 |
| 7 | 5 |
| 8 | 10 |
| 9 | 18 |
| 10 | 46 |
| 11 | 94 |
| 12 | 212 |
| 13 | 476 |
| 14 | 1058 |
| 15 | 2441 |
| 16 | 5564 |
| 17 | 12880 |
| 18 | 29920 |
| 19 | 69620 |
| 20 | 163220 |
| 21 | 383376 |
| 22 | 904114 |
| 23 | 2139592 |
| 24 | 5074784 |
| 25 | 12074152 |
| 26 | 28789112 |
| 27 | 68803148 |
| 28 | 164779064 |
| 29 | 395373108 |
| 30 | 950416330 |
| 31 | 2288438591 |
| 32 | 5518864858 |
| 33 | 13329183894 |
| 34 | 32237132814 |
| 35 | 78069124640 |
[1,0,1,0,2,2,5,10,18,46,94,212,476,1058,2441,5564, 12880,29920,69620,163220,383376,904114,2139592, 5074784,12074152,28789112,68803148,164779064, 395373108,950416330,2288438591,5518864858, 13329183894,32237132814,78069124640] |