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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -4 |
| 3 | -24 |
| 4 | 272 |
| 5 | 14528 |
| 6 | 181312 |
| 7 | -20265088 |
| 8 | -1771263744 |
| 9 | -4388386816 |
| 10 | 16325400792064 |
| 11 | 1796402984175616 |
| 12 | -109123852786069504 |
| 13 | -68488660591133114368 |
| 14 | -7567377513364063567872 |
[1,0,-4,-24,272,14528,181312,-20265088, -1771263744,-4388386816,16325400792064, 1796402984175616,-109123852786069504, -68488660591133114368,-7567377513364063567872] |