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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 6 |
| 5 | 0 |
| 6 | 15 |
| 7 | 0 |
| 8 | 24 |
| 9 | 0 |
| 10 | 63 |
| 11 | 0 |
| 12 | 123 |
| 13 | 4 |
| 14 | 255 |
| 15 | 0 |
| 16 | 502 |
| 17 | 8 |
| 18 | 950 |
| 19 | 73 |
| 20 | 1685 |
| 21 | 162 |
| 22 | 3932 |
| 23 | 160 |
| 24 | 7806 |
| 25 | 385 |
| 26 | 15982 |
| 27 | 530 |
| 28 | 32237 |
| 29 | 658 |
| 30 | 64621 |
| 31 | 914 |
| 32 | 130189 |
| 33 | 994 |
| 34 | 245725 |
| 35 | 16418 |
| 36 | 441373 |
| 37 | 56291 |
| 38 | 992768 |
| 39 | 55036 |
| 40 | 2009344 |
| 41 | 90078 |
| 42 | 3973152 |
| 43 | 233947 |
| 44 | 8154628 |
| 45 | 200952 |
| 46 | 16553734 |
[1,1,2,1,6,0,15,0,24,0,63,0,123,4,255,0,502,8,950, 73,1685,162,3932,160,7806,385,15982,530,32237,658, 64621,914,130189,994,245725,16418,441373,56291, 992768,55036,2009344,90078,3973152,233947,8154628, 200952,16553734] |