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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -2 |
| 3 | -20 |
| 4 | -394 |
| 5 | -72756 |
| 6 | -38636660 |
| 7 | -62621451464 |
| 8 | -320115036508314 |
| 9 | -5370757579794299764 |
| 10 | -307243789286348665328060 |
| 11 | -61750332256061511777753774808 |
| 12 | -44549932891827456895274618101297860 |
| 13 | -117151486172958209318246658698308578710856 |
[1,2,-2,-20,-394,-72756,-38636660,-62621451464, -320115036508314,-5370757579794299764, -307243789286348665328060, -61750332256061511777753774808, -44549932891827456895274618101297860, -117151486172958209318246658698308578710856] |