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A011798
as a simple table
n
a(n)
1
-1
2
-6
3
-34
4
-40
5
5829
6
225568
7
7221500
8
229477248
9
5781285995
10
264454496768
[-1,-6,-34,-40,5829,225568,7221500,229477248, 5781285995,264454496768]