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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | -120 |
| 4 | 15120 |
| 5 | -1003200 |
| 6 | 175323456 |
| 7 | -30612097152 |
| 8 | 8428742150400 |
| 9 | -2694273274447872 |
| 10 | 1128666024421563392 |
| 11 | -559638290295925823488 |
| 12 | 336992041752644836265984 |
| 13 | -237186459370976230365020160 |
[1,0,12,-120,15120,-1003200,175323456, -30612097152,8428742150400,-2694273274447872, 1128666024421563392,-559638290295925823488, 336992041752644836265984, -237186459370976230365020160] |