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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -6 |
| 3 | 140 |
| 4 | -14570 |
| 5 | 6283452 |
| 6 | -11049839724 |
| 7 | 78893138035608 |
| 8 | -2282580118745565210 |
| 9 | 267227101453296251927660 |
| 10 | -126415241162450125116966673796 |
| 11 | 241332381844862786094865482962203112 |
| 12 | -1857025703922208959523779453799872508349700 |
[1,2,-6,140,-14570,6283452,-11049839724, 78893138035608,-2282580118745565210, 267227101453296251927660, -126415241162450125116966673796, 241332381844862786094865482962203112, -1857025703922208959523779453799872508349700] |