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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 76 |
| 3 | -3312 |
| 4 | 255952 |
| 5 | -30728512 |
| 6 | 5281229760 |
| 7 | -1228900532992 |
| 8 | 371761489090816 |
| 9 | -141763213277045760 |
| 10 | 66504626862819552256 |
| 11 | -37635004127910391803904 |
| 12 | 25277676503178610861756416 |
[1,-4,76,-3312,255952,-30728512,5281229760, -1228900532992,371761489090816, -141763213277045760,66504626862819552256, -37635004127910391803904, 25277676503178610861756416] |