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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 7 |
| 3 | 0 |
| 4 | 29 |
| 5 | 4 |
| 6 | 125 |
| 7 | 12 |
| 8 | 477 |
| 9 | 92 |
| 10 | 2037 |
| 11 | 212 |
| 12 | 7669 |
| 13 | 1492 |
| 14 | 32701 |
| 15 | 3188 |
| 16 | 122589 |
| 17 | 24500 |
| 18 | 523469 |
| 19 | 52780 |
| 20 | 1964749 |
| 21 | 378380 |
| 22 | 8367853 |
| 23 | 818764 |
| 24 | 31384077 |
| 25 | 6274796 |
| 26 | 133964365 |
| 27 | 13544972 |
| 28 | 502998765 |
| 29 | 96863820 |
| 30 | 2142123533 |
| 31 | 209639116 |
| 32 | 8034199053 |
| 33 | 1606125260 |
| 34 | 34295260829 |
[1,0,7,0,29,4,125,12,477,92,2037,212,7669,1492, 32701,3188,122589,24500,523469,52780,1964749, 378380,8367853,818764,31384077,6274796,133964365, 13544972,502998765,96863820,2142123533,209639116, 8034199053,1606125260,34295260829] |