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A213235
as a simple table
n
a(n)
0
2
1
1
2
1
3
-2
4
1
5
-3
6
1
7
-4
8
2
9
1
10
-5
11
5
12
1
13
-6
14
4
15
2
16
1
17
-7
18
1
19
-7
[2,1,1,-2,1,-3,1,-4,2,1,-5,5,1,-6,4,2,1,-7,1,-7]