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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | -2 |
| 3 | -14 |
| 4 | -180 |
| 5 | -3344 |
| 6 | -80750 |
| 7 | -2394792 |
| 8 | -84150248 |
| 9 | -3417051136 |
| 10 | -157409163162 |
| 11 | -8109659900000 |
| 12 | -462005414448732 |
| 13 | -28837128777928704 |
| 14 | -1956971256267512966 |
| 15 | -143459789419986793600 |
| 16 | -11297467798871681250000 |
| 17 | -951158499840260908777472 |
[-1,-2,-14,-180,-3344,-80750,-2394792,-84150248, -3417051136,-157409163162,-8109659900000, -462005414448732,-28837128777928704, -1956971256267512966,-143459789419986793600, -11297467798871681250000, -951158499840260908777472] |