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A138557 as a simple table

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

[1,-2,2,-4,5,-4,6,-8,7,-10,12,-8,12,-12,10,-16,16,
 -14,20,-20,12,-24,22,-16,25,-24,20,-24,30,-20,32,
 -32,24,-32,30,-28,36,-40,24,-40,42,-24,42,-48,35,
 -44,46,-32,43,-50,32,-48,52,-40,60,-48,40,-60,60,
 -40]