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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -16 |
| 3 | 128 |
| 4 | 9984 |
| 5 | -1686528 |
| 6 | 211630080 |
| 7 | -21438504960 |
| 8 | -115777536000 |
| 9 | 1290343156285440 |
| 10 | -677718502185369600 |
| 11 | 262776565415742013440 |
| 12 | -69499554745499013611520 |
| 13 | -9137401716948937432104960 |
[0,2,-16,128,9984,-1686528,211630080,-21438504960, -115777536000,1290343156285440, -677718502185369600,262776565415742013440, -69499554745499013611520, -9137401716948937432104960] |