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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 16 |
| 3 | -104 |
| 4 | 1600 |
| 5 | -29952 |
| 6 | 644736 |
| 7 | -18383616 |
| 8 | 645554176 |
| 9 | -25645936640 |
| 10 | 1160636121088 |
| 11 | -60217271582720 |
| 12 | 3462113293664256 |
| 13 | -212189015619731456 |
| 14 | 13428030504825257984 |
| 15 | -819223993894210109440 |
| 16 | 36420049717189727485952 |
[1,-2,16,-104,1600,-29952,644736,-18383616, 645554176,-25645936640,1160636121088, -60217271582720,3462113293664256, -212189015619731456,13428030504825257984, -819223993894210109440,36420049717189727485952] |