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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12800 |
| 3 | 0 |
| 4 | 27315200 |
| 5 | 0 |
| 6 | 23338104320 |
| 7 | 0 |
| 8 | 10698844067840 |
| 9 | 0 |
| 10 | 3058431999744512 |
| 11 | 0 |
| 12 | 597778600580572160 |
| 13 | 0 |
| 14 | 85027230683021319680 |
| 15 | 0 |
| 16 | 9208060526880831549440 |
| 17 | 0 |
| 18 | 785696146272773983470080 |
| 19 | 0 |
| 20 | 54264336460274894557740032 |
| 21 | 0 |
| 22 | 3100237607076259583597381120 |
| 23 | 0 |
| 24 | 149174495875885415147284367360 |
| 25 | 0 |
[1,0,12800,0,27315200,0,23338104320,0, 10698844067840,0,3058431999744512,0, 597778600580572160,0,85027230683021319680,0, 9208060526880831549440,0,785696146272773983470080, 0,54264336460274894557740032,0, 3100237607076259583597381120,0, 149174495875885415147284367360,0] |