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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -4 |
| 2 | 0 |
| 3 | -1440 |
| 4 | 17920 |
| 5 | -7257600 |
| 6 | 395366400 |
| 7 | -175791616000 |
| 8 | 24049778688000 |
| 9 | -13090802909184000 |
| 10 | 3482386518507520000 |
| 11 | -2338795470534082560000 |
| 12 | 1043344639170183168000000 |
| 13 | -855872901958901432320000000 |
[0,-4,0,-1440,17920,-7257600,395366400, -175791616000,24049778688000,-13090802909184000, 3482386518507520000,-2338795470534082560000, 1043344639170183168000000, -855872901958901432320000000] |