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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -6 |
| 3 | 42 |
| 4 | -468 |
| 5 | 7080 |
| 6 | -133128 |
| 7 | 2938824 |
| 8 | -73169568 |
| 9 | 1997384832 |
| 10 | -58814501760 |
| 11 | 1868053207680 |
| 12 | -65311214042880 |
| 13 | 2585560450337280 |
| 14 | -115344597684718080 |
| 15 | 5424254194395456000 |
| 16 | -244310147229735014400 |
| 17 | 10256126830544041574400 |
[0,2,-6,42,-468,7080,-133128,2938824,-73169568, 1997384832,-58814501760,1868053207680, -65311214042880,2585560450337280, -115344597684718080,5424254194395456000, -244310147229735014400,10256126830544041574400] |