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A257902 as a simple table

na(n)
12
21
33
4-2
54
6-3
75
8-1
96
10-8
117
128
13-11
149
15-7
1610
17-6
18-5
1912
2011
21-19
2213
23-10
2414
25-15
2616
27-13
2815
29-9
3017
31-18
3219
33-20
3418
35-12
3620
37-23
3821
39-17
4022
41-24
4223
43-16
4424
45-22
4625
47-26
4827
49-25
5026
51-14
52-4
5328
54-35
5529
56-28
5730
5831
59-57
6032
61-31
6233

[2,1,3,-2,4,-3,5,-1,6,-8,7,8,-11,9,-7,10,-6,-5,12,
 11,-19,13,-10,14,-15,16,-13,15,-9,17,-18,19,-20,
 18,-12,20,-23,21,-17,22,-24,23,-16,24,-22,25,-26,
 27,-25,26,-14,-4,28,-35,29,-28,30,31,-57,32,-31,
 33]