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A015316 as a simple table

na(n)
51
6-90909
79182728191
8-917355454462809
991744720010017447191
10-9174380256281734701652809
11917438943076290926712489347191
12-91743885133148835462057759420652809

[1,-90909,9182728191,-917355454462809,
 91744720010017447191,-9174380256281734701652809,
 917438943076290926712489347191,
 -91743885133148835462057759420652809]