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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -2 |
| 3 | 44 |
| 4 | 1408 |
| 5 | -18016 |
| 6 | -5095232 |
| 7 | -139605376 |
| 8 | 56961507328 |
| 9 | 8306292414464 |
| 10 | -1178066937638912 |
| 11 | -640316054325354496 |
| 12 | -7088737339266301952 |
| 13 | 76268423227563817631744 |
| 14 | 18895160315230467816030208 |
| 15 | -12297988177132848140606242816 |
[0,-1,-2,44,1408,-18016,-5095232,-139605376, 56961507328,8306292414464,-1178066937638912, -640316054325354496,-7088737339266301952, 76268423227563817631744, 18895160315230467816030208, -12297988177132848140606242816] |