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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -40 |
| 4 | -896 |
| 5 | -62304 |
| 6 | -6036096 |
| 7 | -878453888 |
| 8 | -172356091904 |
| 9 | -44229410876928 |
| 10 | -14356887611836416 |
| 11 | -5752160769829099520 |
| 12 | -2787961066322579554304 |
| 13 | -1607823657408554342604800 |
[1,0,0,-40,-896,-62304,-6036096,-878453888, -172356091904,-44229410876928,-14356887611836416, -5752160769829099520,-2787961066322579554304, -1607823657408554342604800] |