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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 3 |
| 9 | 8 |
| 10 | 20 |
| 11 | 48 |
| 12 | 112 |
| 13 | 300 |
| 14 | 752 |
| 15 | 1712 |
| 16 | 3839 |
| 17 | 8507 |
| 18 | 18668 |
| 19 | 43437 |
| 20 | 98919 |
| 21 | 221527 |
| 22 | 478718 |
| 23 | 1027994 |
| 24 | 2196398 |
| 25 | 4811804 |
| 26 | 10446823 |
| 27 | 22508560 |
| 28 | 48207309 |
| 29 | 101582640 |
| 30 | 213430157 |
| 31 | 456774962 |
| 32 | 972054283 |
[0,0,0,0,0,0,0,1,3,8,20,48,112,300,752,1712,3839, 8507,18668,43437,98919,221527,478718,1027994, 2196398,4811804,10446823,22508560,48207309, 101582640,213430157,456774962,972054283] |