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A012295
as a simple table
n
a(n)
0
0
1
2
2
-8
3
-88
4
6592
5
-251488
6
4158592
7
551599232
8
-94759774208
9
9549823734272
[0,2,-8,-88,6592,-251488,4158592,551599232, -94759774208,9549823734272]