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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | -232 |
| 4 | -25600 |
| 5 | -2258048 |
| 6 | -212565376 |
| 7 | -21159275264 |
| 8 | -1935285600256 |
| 9 | -49976214294528 |
| 10 | 63805712413261824 |
| 11 | 35001400723765723136 |
| 12 | 14864146970063529476096 |
| 13 | 5873322147682909938319360 |
| 14 | 2179283235919329416585674752 |
| 15 | 684206903818546691477749366784 |
[1,2,8,-232,-25600,-2258048,-212565376, -21159275264,-1935285600256,-49976214294528, 63805712413261824,35001400723765723136, 14864146970063529476096,5873322147682909938319360, 2179283235919329416585674752, 684206903818546691477749366784] |