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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 0 |
| 3 | -32 |
| 4 | -640 |
| 5 | 1024 |
| 6 | 661504 |
| 7 | 25305088 |
| 8 | -948699136 |
| 9 | -216606572544 |
| 10 | -10006005547008 |
| 11 | 2013855760777216 |
| 12 | 462400685741178880 |
| 13 | 10633324821284388864 |
| 14 | -16549579084211148554240 |
[0,2,0,-32,-640,1024,661504,25305088,-948699136, -216606572544,-10006005547008,2013855760777216, 462400685741178880,10633324821284388864, -16549579084211148554240] |