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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | -120 |
| 4 | 8400 |
| 5 | -600000 |
| 6 | 73313856 |
| 7 | -12123226752 |
| 8 | 2695239655680 |
| 9 | -769790431168512 |
| 10 | 275082505104161792 |
| 11 | -120207067043213252608 |
| 12 | 63066575428691877122048 |
| 13 | -39120958138480154972405760 |
[1,0,12,-120,8400,-600000,73313856,-12123226752, 2695239655680,-769790431168512,275082505104161792, -120207067043213252608,63066575428691877122048, -39120958138480154972405760] |