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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 8 |
| 7 | 21 |
| 8 | 42 |
| 9 | 96 |
| 10 | 222 |
| 11 | 495 |
| 12 | 1177 |
| 13 | 2717 |
| 14 | 6435 |
| 15 | 15288 |
| 16 | 36374 |
| 17 | 87516 |
| 18 | 210494 |
| 19 | 509694 |
| 20 | 1237736 |
| 21 | 3014882 |
| 22 | 7370860 |
| 23 | 18059899 |
| 24 | 44379535 |
| 25 | 109298070 |
| 26 | 269766655 |
| 27 | 667224480 |
| 28 | 1653266565 |
| 29 | 4103910930 |
| 30 | 10203669285 |
| 31 | 25408828065 |
| 32 | 63364046190 |
| 33 | 158229645720 |
| 34 | 395632288590 |
| 35 | 990419552730 |
[1,0,1,1,2,5,8,21,42,96,222,495,1177,2717,6435, 15288,36374,87516,210494,509694,1237736,3014882, 7370860,18059899,44379535,109298070,269766655, 667224480,1653266565,4103910930,10203669285, 25408828065,63364046190,158229645720,395632288590, 990419552730] |