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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | -58 |
| 3 | -1976 |
| 4 | -125878 |
| 5 | -9435956 |
| 6 | -836433778 |
| 7 | -89733620336 |
[2,4,-58,-1976,-125878,-9435956,-836433778, -89733620336] |