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A068512 as a simple table

na(n)
1-1
20
3-1
41
5-3
61
7-5
84
93
101
11-9
125
13-11
141
151
1612
17-15
186
19-17
207
21-1
221
23-21
2416
25-5
261
2727
289
29-27
308
31-29
3232
33-5
341
35-11
3621
37-35
381
39-7
4024
41-39
4210
43-41
4413
4533
461
47-45
4844
49-21
5010
51-11
5215
53-51
5427
55-23
5632
57-13
581
59-57
6031
61-59

[-1,0,-1,1,-3,1,-5,4,3,1,-9,5,-11,1,1,12,-15,6,
 -17,7,-1,1,-21,16,-5,1,27,9,-27,8,-29,32,-5,1,-11,
 21,-35,1,-7,24,-39,10,-41,13,33,1,-45,44,-21,10,
 -11,15,-51,27,-23,32,-13,1,-57,31,-59]