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A213235 as a simple table

na(n)
02
11
21
3-2
41
5-3
61
7-4
82
91
10-5
115
121
13-6
144
152
161
17-7
181
19-7

[2,1,1,-2,1,-3,1,-4,2,1,-5,5,1,-6,4,2,1,-7,1,-7]