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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -28 |
| 3 | 1160 |
| 4 | -3504 |
| 5 | -3908896 |
| 6 | 360691008 |
| 7 | 14544047232 |
| 8 | -11198480094976 |
| 9 | 1531305962216960 |
| 10 | 340347851378082816 |
| 11 | -234547726326061201408 |
| 12 | 32383387692585279868928 |
| 13 | 30186184832886791121723392 |
[1,-2,-28,1160,-3504,-3908896,360691008, 14544047232,-11198480094976,1531305962216960, 340347851378082816,-234547726326061201408, 32383387692585279868928, 30186184832886791121723392] |