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A006140 as a simple table

na(n)
01
11
2-2
32
4-2
51
60
71
8-2
90
102
110
12-1
13-2
142
151
160
17-2
182
19-2

[1,1,-2,2,-2,1,0,1,-2,0,2,0,-1,-2,2,1,0,-2,2,-2]