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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -32 |
| 2 | 496 |
| 3 | -4992 |
| 4 | 36984 |
| 5 | -217280 |
| 6 | 1066432 |
| 7 | -4548352 |
| 8 | 17369116 |
| 9 | -60711456 |
| 10 | 197327712 |
| 11 | -603261056 |
| 12 | 1749861312 |
| 13 | -4849210560 |
| 14 | 12909347456 |
| 15 | -33162318080 |
| 16 | 82507571334 |
| 17 | -199432268416 |
| 18 | 469559849680 |
| 19 | -1079335967872 |
[1,-32,496,-4992,36984,-217280,1066432,-4548352, 17369116,-60711456,197327712,-603261056, 1749861312,-4849210560,12909347456,-33162318080, 82507571334,-199432268416,469559849680, -1079335967872] |