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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -12 |
| 3 | 120 |
| 4 | -5040 |
| 5 | 398400 |
| 6 | -42267456 |
| 7 | 6511220352 |
| 8 | -1348919320320 |
| 9 | 361546293368832 |
| 10 | -121866178161646592 |
| 11 | 50449587034359175168 |
| 12 | -25164869672254098452480 |
| 13 | 14886957060645519281602560 |
[1,0,-12,120,-5040,398400,-42267456,6511220352, -1348919320320,361546293368832, -121866178161646592,50449587034359175168, -25164869672254098452480, 14886957060645519281602560] |