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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 0 |
| 4 | 12 |
| 5 | 0 |
| 6 | 56 |
| 7 | 0 |
| 8 | 48 |
| 9 | 0 |
| 10 | 480 |
| 11 | 0 |
| 12 | 3264 |
| 13 | 0 |
| 14 | 16256 |
| 15 | 0 |
| 16 | 768 |
| 17 | 0 |
| 18 | 7680 |
| 19 | 0 |
| 20 | 52224 |
| 21 | 0 |
| 22 | 522240 |
| 23 | 0 |
| 24 | 3158016 |
| 25 | 0 |
| 26 | 31580160 |
| 27 | 0 |
| 28 | 214745088 |
| 29 | 0 |
| 30 | 1073709056 |
| 31 | 0 |
| 32 | 196608 |
| 33 | 0 |
| 34 | 1966080 |
| 35 | 0 |
| 36 | 13369344 |
| 37 | 0 |
| 38 | 133693440 |
| 39 | 0 |
| 40 | 808452096 |
| 41 | 0 |
| 42 | 8084520960 |
| 43 | 0 |
| 44 | 54974742528 |
| 45 | 0 |
[1,0,2,0,12,0,56,0,48,0,480,0,3264,0,16256,0,768, 0,7680,0,52224,0,522240,0,3158016,0,31580160,0, 214745088,0,1073709056,0,196608,0,1966080,0, 13369344,0,133693440,0,808452096,0,8084520960,0, 54974742528,0] |