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A134655
as a simple table
n
a(n)
1
1
2
1
3
-1
4
-1
5
2
6
0
7
-1
8
-1
9
-1
10
3
11
4
12
-4
13
-7
14
1
15
5
16
0
17
-1
[1,1,-1,-1,2,0,-1,-1,-1,3,4,-4,-7,1,5,0,-1]