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A085092
as a simple table
n
a(n)
2
1
3
1
4
1
5
1
6
-432000
7
1
8
-3456000
9
-9504000
10
-209520000
11
-389664000
12
-5952960000
13
-289595177265600
[1,1,1,1,-432000,1,-3456000,-9504000,-209520000, -389664000,-5952960000,-289595177265600]