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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 48 |
| 4 | -1040 |
| 5 | 62720 |
| 6 | -4314624 |
| 7 | 498003968 |
| 8 | -70081316864 |
| 9 | 13529482592256 |
| 10 | -3175495421788160 |
| 11 | 933402531586899968 |
| 12 | -326784893253162369024 |
| 13 | 136568449424117316190208 |
| 14 | -66517446960602151366164480 |
[0,1,-2,48,-1040,62720,-4314624,498003968, -70081316864,13529482592256,-3175495421788160, 933402531586899968,-326784893253162369024, 136568449424117316190208, -66517446960602151366164480] |