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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -8 |
| 2 | -80 |
| 3 | -656 |
| 4 | -5264 |
| 5 | -42128 |
| 6 | -337040 |
| 7 | -2696336 |
| 8 | -21570704 |
| 9 | -172565648 |
| 10 | -1380525200 |
| 11 | -11044201616 |
| 12 | -88353612944 |
| 13 | -706828903568 |
| 14 | -5654631228560 |
| 15 | -45237049828496 |
| 16 | -361896398627984 |
| 17 | -2895171189023888 |
| 18 | -23161369512191120 |
[1,-8,-80,-656,-5264,-42128,-337040,-2696336, -21570704,-172565648,-1380525200,-11044201616, -88353612944,-706828903568,-5654631228560, -45237049828496,-361896398627984, -2895171189023888,-23161369512191120] |