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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | -16 |
| 3 | 256 |
| 4 | -1012 |
| 5 | 17168 |
| 6 | -102432 |
| 7 | 1768032 |
| 8 | -12810048 |
| 9 | 226260008 |
| 10 | -1831410544 |
| 11 | 33000429000 |
| 12 | -286340050052 |
| 13 | 5252822116016 |
| 14 | -47718467477584 |
| 15 | 890108488876160 |
| 16 | -8340130846927456 |
| 17 | 158096635640838140 |
| 18 | -1512328959263997360 |
[12,-16,256,-1012,17168,-102432,1768032,-12810048, 226260008,-1831410544,33000429000,-286340050052, 5252822116016,-47718467477584,890108488876160, -8340130846927456,158096635640838140, -1512328959263997360] |