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A127630 as a simple table

na(n)
01
11
2-3
3-3
45
55
6-7
7-7
89
99
10-11
11-11
1213
1313
14-15
15-15
1617
1717
18-19
19-19
2021
2121
22-23
23-23
2425
2525
26-27
27-27
2829
2929
30-31
31-31
3233
3333
34-35
35-35
3637
3737
38-39
39-39
4041
4141
42-43
43-43
4445
4545
46-47
47-47
4849
4949
50-51
51-51
5253
5353
54-55
55-55

[1,1,-3,-3,5,5,-7,-7,9,9,-11,-11,13,13,-15,-15,17,
 17,-19,-19,21,21,-23,-23,25,25,-27,-27,29,29,-31,
 -31,33,33,-35,-35,37,37,-39,-39,41,41,-43,-43,45,
 45,-47,-47,49,49,-51,-51,53,53,-55,-55]