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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | -344 |
| 4 | -44416 |
| 5 | -5130368 |
| 6 | -688030080 |
| 7 | -109875416832 |
| 8 | -20650894622720 |
| 9 | -4460981432725504 |
| 10 | -1069938200055119872 |
| 11 | -268541150093198032896 |
| 12 | -60666450534816002965504 |
| 13 | -3605301387144067469213696 |
[1,2,8,-344,-44416,-5130368,-688030080, -109875416832,-20650894622720,-4460981432725504, -1069938200055119872,-268541150093198032896, -60666450534816002965504, -3605301387144067469213696] |