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A257918 as a simple table

na(n)
12
2-1
33
41
5-2
64
75
8-3
96
10-4
11-5
127
138
14-7
15-6
169
1710
18-8
19-9
2012
2111
22-10
2313
24-11
2514
26-13
2715
28-12
2916
30-14
31-15
3218
33-16
3417
3519
36-17
3720
38-19
39-18
4022
4121
42-20
4323
44-22
4524
46-21
47-23
4825
4926
50-24
5127
52-25
5328
54-26
55-27
5630
57-28
5829
5931
60-29
6132
62-31

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