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A128213 as a simple table

na(n)
01
11
21
3-1
4-4
5-4
61
77
87
9-1
10-10
11-10
121
1313
1413
15-1
16-16
17-16
181
1919
2019
21-1
22-22
23-22
241
2525
2625
27-1
28-28
29-28
301
3131
3231
33-1
34-34
35-34
361
3737
3837
39-1
40-40
41-40
421
4343
4443
45-1
46-46
47-46
481
4949
5049
51-1
52-52
53-52
541
5555
5655
57-1
58-58
59-58
601
6161
6261
63-1

[1,1,1,-1,-4,-4,1,7,7,-1,-10,-10,1,13,13,-1,-16,
 -16,1,19,19,-1,-22,-22,1,25,25,-1,-28,-28,1,31,31,
 -1,-34,-34,1,37,37,-1,-40,-40,1,43,43,-1,-46,-46,
 1,49,49,-1,-52,-52,1,55,55,-1,-58,-58,1,61,61,-1]