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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -128 |
| 2 | 50432 |
| 3 | -63423488 |
| 4 | 186761510912 |
| 5 | -1077443663495168 |
| 6 | 10868880846196047872 |
| 7 | -176707410321941586771968 |
| 8 | 4359687422323728561012211712 |
[2,-128,50432,-63423488,186761510912, -1077443663495168,10868880846196047872, -176707410321941586771968, 4359687422323728561012211712] |