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A138512 as a simple table

na(n)
11
2-1
32
4-3
55
6-2
76
8-5
97
10-5
1112
12-6
1312
14-6
1510
16-11
1716
18-7
1920
20-15
2112
22-12
2322
24-10
2525
26-12
2720
28-18
2930
30-10
3132
32-21
3324
34-16
3530
36-21
3736
38-20
3924
40-25
4142
42-12
4342
44-36
4535
46-22
4746
48-22
4943
50-25
5132
52-36
5352
54-20
5560
56-30
5740
58-30
5960
60-30
6162

[1,-1,2,-3,5,-2,6,-5,7,-5,12,-6,12,-6,10,-11,16,
 -7,20,-15,12,-12,22,-10,25,-12,20,-18,30,-10,32,
 -21,24,-16,30,-21,36,-20,24,-25,42,-12,42,-36,35,
 -22,46,-22,43,-25,32,-36,52,-20,60,-30,40,-30,60,
 -30,62]