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A011758
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
-1
7
-1
8
1
9
1
10
-1
11
1
12
-1
13
1
[1,1,1,1,1,-1,-1,1,1,-1,1,-1,1]
