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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -160 |
| 4 | 0 |
| 5 | -691200 |
| 6 | 3942400 |
| 7 | -14125363200 |
| 8 | 295206912000 |
| 9 | -902471385088000 |
| 10 | 43911376404480000 |
| 11 | -140627264197754880000 |
| 12 | 12856220870209699840000 |
| 13 | -45500991975079280640000000 |
[1,0,0,-160,0,-691200,3942400,-14125363200, 295206912000,-902471385088000,43911376404480000, -140627264197754880000,12856220870209699840000, -45500991975079280640000000] |