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A111580 as a simple table

na(n)
11
2-2
3-2
44
51
64
7-6
8-8
97
10-2
1112
12-8
13-12
1412
15-2
1616
17-16
18-14
1920
204
2112
22-24
23-22
2416
251
2624
27-20
28-24
2930
304
3132
32-32
33-24
3432
35-6
3628
37-36
38-40
3924
40-8
4142
42-24
43-42
4448
457
4644
47-46
48-32
4943
50-2
5132
52-48
53-52
5440
5512
5648
57-40
58-60
5960
60-8
6162
62-64
63-42
6464
65-12
6648
67-66
68-64
6944
7012
7172
72-56
73-72
7472

[1,-2,-2,4,1,4,-6,-8,7,-2,12,-8,-12,12,-2,16,-16,
 -14,20,4,12,-24,-22,16,1,24,-20,-24,30,4,32,-32,
 -24,32,-6,28,-36,-40,24,-8,42,-24,-42,48,7,44,-46,
 -32,43,-2,32,-48,-52,40,12,48,-40,-60,60,-8,62,
 -64,-42,64,-12,48,-66,-64,44,12,72,-56,-72,72]