| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 12 |
| 3 | -296 |
| 4 | -25200 |
| 5 | -1885952 |
| 6 | -163728576 |
| 7 | -16916558720 |
| 8 | -2050105730816 |
| 9 | -282656394482688 |
| 10 | -42100913802486784 |
| 11 | -6025333851231979520 |
| 12 | -461235714949468024832 |
| 13 | 265243699159867430764544 |
[1,4,12,-296,-25200,-1885952,-163728576, -16916558720,-2050105730816,-282656394482688, -42100913802486784,-6025333851231979520, -461235714949468024832,265243699159867430764544] |