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A012524 as a simple table

na(n)
02
1-128
250432
3-63423488
4186761510912
5-1077443663495168
610868880846196047872
7-176707410321941586771968
84359687422323728561012211712

[2,-128,50432,-63423488,186761510912,
 -1077443663495168,10868880846196047872,
 -176707410321941586771968,
 4359687422323728561012211712]