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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 5760 |
| 7 | 766080 |
| 8 | 149022720 |
| 9 | 48990251520 |
| 10 | 28928242022400 |
| 11 | 32147584690636800 |
| 12 | 69035206021583155200 |
[1,0,0,0,0,5760,766080,149022720,48990251520, 28928242022400,32147584690636800, 69035206021583155200] |