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A186690 as a simple table

na(n)
11
2-2
34
4-4
56
6-8
78
8-8
913
10-12
1112
12-16
1314
14-16
1524
16-16
1718
18-26
1920
20-24
2132
22-24
2324
24-32
2531
26-28
2740
28-32
2930
30-48
3132
32-32
3348
34-36
3548
36-52
3738
38-40
3956
40-48
4142
42-64
4344
44-48
4578
46-48
4748
48-64
4957
50-62
5172
52-56
5354
54-80
5572
56-64
5780
58-60
5960
60-96
6162
62-64

[1,-2,4,-4,6,-8,8,-8,13,-12,12,-16,14,-16,24,-16,
 18,-26,20,-24,32,-24,24,-32,31,-28,40,-32,30,-48,
 32,-32,48,-36,48,-52,38,-40,56,-48,42,-64,44,-48,
 78,-48,48,-64,57,-62,72,-56,54,-80,72,-64,80,-60,
 60,-96,62,-64]