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A258831 as a simple table

na(n)
01
1-2
23
3-4
45
5-8
67
7-8
89
9-10
1014
11-12
1216
13-14
1415
15-20
1617
17-18
1819
19-24
2026
21-22
2223
23-28
2425
25-32
2632
27-28
2829
29-30
3038
31-32
3233
33-40
3440
35-44
3642
37-38
3839
39-40
4057
41-42
4243
43-44
4445
45-62
4647
47-56
4849
49-56
5062
51-52
5253
53-60
5464
55-68
5664
57-58
5859
59-60

[1,-2,3,-4,5,-8,7,-8,9,-10,14,-12,16,-14,15,-20,
 17,-18,19,-24,26,-22,23,-28,25,-32,32,-28,29,-30,
 38,-32,33,-40,40,-44,42,-38,39,-40,57,-42,43,-44,
 45,-62,47,-56,49,-56,62,-52,53,-60,64,-68,64,-58,
 59,-60]