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A250219
as a simple table
n
a(n)
1
-1
2
-1
3
8
4
0
5
-1
6
4
7
0
8
1
9
0
10
2
11
0
12
0
13
0
14
1
15
0
16
1
17
0
18
0
[-1,-1,8,0,-1,4,0,1,0,2,0,0,0,1,0,1,0,0]