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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 160 |
| 4 | 0 |
| 5 | 691200 |
| 6 | 19712000 |
| 7 | 14125363200 |
| 8 | 1476034560000 |
| 9 | 949310881792000 |
| 10 | 219556882022400000 |
| 11 | 161772486589808640000 |
| 12 | 65109683806263050240000 |
| 13 | 58457850571785240576000000 |
[1,0,0,160,0,691200,19712000,14125363200, 1476034560000,949310881792000,219556882022400000, 161772486589808640000,65109683806263050240000, 58457850571785240576000000] |