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A257904 as a simple table

na(n)
13
21
32
4-1
54
6-2
75
8-4
96
10-3
117
12-8
139
14-6
158
16-5
1710
18-11
1912
20-10
2111
2213
23-21
2414
25-12
2615
27-14
2816
29-15
3018
31-17
3219
33-13
3417
35-19
3620
37-16
3821
39-24
4022
41-20
4223
43-9
4424
45-35
4625
47-22
4826
49-28
5027
51-23
5228
53-25
5429
55-27
5630
57-18
58-7
5931
60-34
6132
62-26

[3,1,2,-1,4,-2,5,-4,6,-3,7,-8,9,-6,8,-5,10,-11,12,
 -10,11,13,-21,14,-12,15,-14,16,-15,18,-17,19,-13,
 17,-19,20,-16,21,-24,22,-20,23,-9,24,-35,25,-22,
 26,-28,27,-23,28,-25,29,-27,30,-18,-7,31,-34,32,
 -26]