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A257907 as a simple table

na(n)
11
22
33
4-2
54
6-3
75
8-1
97
10-9
118
12-4
139
14-8
1510
16-5
1715
18-19
1911
20-10
2112
22-7
2317
24-18
2516
26-13
2719
28-17
2921
30-16
3126
32-29
3323
34-21
3525
36-23
3727
38-26
3928
40-27
4129
42-25
4333
44-35
4531
46-22
4740
48-45
4935
50-34
5136
52-33
5339
54-41
5537
56-31
5743
58-42
5944
60-47
6141

[1,2,3,-2,4,-3,5,-1,7,-9,8,-4,9,-8,10,-5,15,-19,
 11,-10,12,-7,17,-18,16,-13,19,-17,21,-16,26,-29,
 23,-21,25,-23,27,-26,28,-27,29,-25,33,-35,31,-22,
 40,-45,35,-34,36,-33,39,-41,37,-31,43,-42,44,-47,
 41]