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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 32 |
| 3 | -1224 |
| 4 | 89984 |
| 5 | -10705408 |
| 6 | 1889967232 |
| 7 | -464238999808 |
| 8 | 151661217091584 |
| 9 | -63641246944645120 |
| 10 | 33381024310383640576 |
| 11 | -21408234533329528127488 |
| 12 | 16485197581627921671815168 |
[1,-2,32,-1224,89984,-10705408,1889967232, -464238999808,151661217091584,-63641246944645120, 33381024310383640576,-21408234533329528127488, 16485197581627921671815168] |