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A257915 as a simple table

na(n)
13
21
32
4-1
54
6-2
75
8-4
96
10-3
117
12-5
138
14-6
159
16-7
1710
18-8
19-9
2012
2111
22-10
2313
24-11
2514
26-13
2715
28-12
2916
30-14
31-15
3218
3317
34-16
3519
36-17
3720
38-19
39-18
4022
4121
42-20
4323
44-22
4524
46-21
4725
48-23
4926
50-25
5127
52-24
5328
54-26
55-27
5630
57-28
5829
5931
60-29
6132
62-31

[3,1,2,-1,4,-2,5,-4,6,-3,7,-5,8,-6,9,-7,10,-8,-9,
 12,11,-10,13,-11,14,-13,15,-12,16,-14,-15,18,17,
 -16,19,-17,20,-19,-18,22,21,-20,23,-22,24,-21,25,
 -23,26,-25,27,-24,28,-26,-27,30,-28,29,31,-29,32,
 -31]