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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 0 |
| 4 | 74 |
| 5 | 0 |
| 6 | 1140 |
| 7 | 0 |
| 8 | 19562 |
| 9 | 0 |
| 10 | 357756 |
| 11 | 0 |
| 12 | 6824684 |
| 13 | 0 |
| 14 | 134166696 |
| 15 | 0 |
| 16 | 2697855082 |
| 17 | 0 |
| 18 | 55213424556 |
| 19 | 0 |
| 20 | 1146078241284 |
| 21 | 0 |
| 22 | 24067465856088 |
| 23 | 0 |
| 24 | 510351502965548 |
| 25 | 0 |
| 26 | 10911807871502232 |
| 27 | 0 |
| 28 | 234970037988773560 |
| 29 | 0 |
| 30 | 5091149074269149520 |
| 31 | 0 |
| 32 | 110912377099411850090 |
| 33 | 0 |
[1,0,6,0,74,0,1140,0,19562,0,357756,0,6824684,0, 134166696,0,2697855082,0,55213424556,0, 1146078241284,0,24067465856088,0,510351502965548, 0,10911807871502232,0,234970037988773560,0, 5091149074269149520,0,110912377099411850090,0] |