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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -6 |
| 2 | 48 |
| 3 | -300 |
| 4 | 2316 |
| 5 | -14916 |
| 6 | 112188 |
| 7 | -738660 |
| 8 | 5450556 |
| 9 | -36474276 |
| 10 | 265397628 |
| 11 | -1797317220 |
| 12 | 12944017596 |
| 13 | -88431340836 |
| 14 | 632080079868 |
| 15 | -4346196394980 |
| 16 | 30893559749436 |
| 17 | -213433808338596 |
| 18 | 1510963317814908 |
[1,-6,48,-300,2316,-14916,112188,-738660,5450556, -36474276,265397628,-1797317220,12944017596, -88431340836,632080079868,-4346196394980, 30893559749436,-213433808338596,1510963317814908] |