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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 32 |
| 3 | -944 |
| 4 | 64640 |
| 5 | -5881600 |
| 6 | 919673856 |
| 7 | -172830523392 |
| 8 | 48225099218944 |
| 9 | -15466881283850240 |
| 10 | 6745794347282989056 |
| 11 | -3302151520495305490432 |
| 12 | 2072514460288282576027648 |
| 13 | -1438958551527596730993344512 |
[1,-2,32,-944,64640,-5881600,919673856, -172830523392,48225099218944,-15466881283850240, 6745794347282989056,-3302151520495305490432, 2072514460288282576027648, -1438958551527596730993344512] |