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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 6 |
| 4 | -4 |
| 5 | 300 |
| 6 | -828 |
| 7 | 42224 |
| 8 | -266992 |
| 9 | 11916864 |
| 10 | -132472320 |
| 11 | 5688511488 |
| 12 | -95465876064 |
| 13 | 4138883728512 |
| 14 | -95019458907072 |
| 15 | 4276023328128000 |
| 16 | -125481256750340352 |
| 17 | 5958015717717504000 |
| 18 | -212934915549001078272 |
| 19 | 10767675634298110255104 |
[1,1,0,6,-4,300,-828,42224,-266992,11916864, -132472320,5688511488,-95465876064,4138883728512, -95019458907072,4276023328128000, -125481256750340352,5958015717717504000, -212934915549001078272,10767675634298110255104] |