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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -31 |
| 2 | 434 |
| 3 | -3627 |
| 4 | 20367 |
| 5 | -84537 |
| 6 | 296825 |
| 7 | -1027805 |
| 8 | 3586700 |
| 9 | -11522204 |
| 10 | 33703882 |
| 11 | -97807604 |
| 12 | 289043659 |
| 13 | -814257997 |
| 14 | 2164448117 |
| 15 | -5763699428 |
| 16 | 15479115951 |
| 17 | -40058137473 |
| 18 | 100379076723 |
| 19 | -252617470522 |
| 20 | 633832842041 |
[1,-31,434,-3627,20367,-84537,296825,-1027805, 3586700,-11522204,33703882,-97807604,289043659, -814257997,2164448117,-5763699428,15479115951, -40058137473,100379076723,-252617470522, 633832842041] |