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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 3 |
| 5 | 0 |
| 6 | 4 |
| 7 | 0 |
| 8 | 5 |
| 9 | 1 |
| 10 | 6 |
| 11 | 6 |
| 12 | 7 |
| 13 | 21 |
| 14 | 8 |
| 15 | 56 |
| 16 | 9 |
| 17 | 126 |
| 18 | 11 |
| 19 | 252 |
| 20 | 21 |
| 21 | 462 |
| 22 | 67 |
| 23 | 792 |
| 24 | 233 |
| 25 | 1287 |
| 26 | 729 |
| 27 | 2003 |
| 28 | 2017 |
| 29 | 3017 |
| 30 | 5021 |
| 31 | 4473 |
| 32 | 11457 |
| 33 | 6748 |
| 34 | 24328 |
| 35 | 10948 |
| 36 | 48640 |
| 37 | 20196 |
| 38 | 92416 |
| 39 | 42636 |
| 40 | 168152 |
| 41 | 97869 |
| 42 | 295092 |
| 43 | 229824 |
| 44 | 503428 |
| 45 | 531070 |
| 46 | 843548 |
| 47 | 1186592 |
| 48 | 1408476 |
[1,0,2,0,3,0,4,0,5,1,6,6,7,21,8,56,9,126,11,252, 21,462,67,792,233,1287,729,2003,2017,3017,5021, 4473,11457,6748,24328,10948,48640,20196,92416, 42636,168152,97869,295092,229824,503428,531070, 843548,1186592,1408476] |