A015316 - OEIS

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A015316 as a simple table

n	a(n)
5	1
6	-90909
7	9182728191
8	-917355454462809
9	91744720010017447191
10	-9174380256281734701652809
11	917438943076290926712489347191
12	-91743885133148835462057759420652809

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