| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 16 |
| 3 | -440 |
| 4 | 20224 |
| 5 | -1582976 |
| 6 | 178612864 |
| 7 | -27969867008 |
| 8 | 5765737517056 |
| 9 | -1516228355846144 |
| 10 | 495092243779256320 |
| 11 | -196552136456231321600 |
| 12 | 93232152295610535018496 |
| 13 | -52074797114273752377786368 |
[1,-2,16,-440,20224,-1582976,178612864, -27969867008,5765737517056,-1516228355846144, 495092243779256320,-196552136456231321600, 93232152295610535018496, -52074797114273752377786368] |