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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -36 |
| 3 | 360 |
| 4 | -4320 |
| 5 | 57024 |
| 6 | -816480 |
| 7 | 12737088 |
| 8 | -216950400 |
| 9 | 3985853184 |
| 10 | -77049957888 |
| 11 | 1524488905728 |
| 12 | -30107409053184 |
| 13 | 576921511037952 |
| 14 | -9954313034508288 |
| 15 | 94929987120648192 |
| 16 | 5615966537573179392 |
| 17 | -686220690340602003456 |
| 18 | 57421269146260788903936 |
[1,6,-36,360,-4320,57024,-816480,12737088, -216950400,3985853184,-77049957888,1524488905728, -30107409053184,576921511037952,-9954313034508288, 94929987120648192,5615966537573179392, -686220690340602003456,57421269146260788903936] |