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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -16 |
| 3 | -3584 |
| 4 | -1114112 |
| 5 | -771751936 |
| 6 | -68719476736 |
| 7 | 50102545854496768 |
| 8 | 4999067643975288487936 |
| 9 | 1104958199127771065681444864 |
| 10 | 363815722265501838229553819942912 |
[1,2,-16,-3584,-1114112,-771751936,-68719476736, 50102545854496768,4999067643975288487936, 1104958199127771065681444864, 363815722265501838229553819942912] |