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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 12 |
| 4 | 0 |
| 5 | 120 |
| 6 | 10800 |
| 7 | 1680 |
| 8 | 766080 |
| 9 | 55913760 |
| 10 | 48686400 |
| 11 | 12973625280 |
| 12 | 878369184000 |
| 13 | 2257312337280 |
| 14 | 475877474392320 |
| 15 | 31178226637958400 |
| 16 | 176135891323392000 |
| 17 | 32566007822802854400 |
| 18 | 2111180034178805990400 |
| 19 | 22027962609483730099200 |
| 20 | 3749400628293386626560000 |
| 21 | 244391453278125083388057600 |
[1,0,0,12,0,120,10800,1680,766080,55913760, 48686400,12973625280,878369184000,2257312337280, 475877474392320,31178226637958400, 176135891323392000,32566007822802854400, 2111180034178805990400,22027962609483730099200, 3749400628293386626560000, 244391453278125083388057600] |