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A122918 as a simple table

na(n)
01
10
2-2
32
41
5-4
63
72
8-6
94
103
11-8
125
134
14-10
156
165
17-12
187
196
20-14
218
227
23-16
249
258
26-18
2710
289
29-20
3011
3110
32-22
3312
3411
35-24
3613
3712
38-26
3914
4013
41-28
4215
4314
44-30
4516
4615
47-32
4817
4916
50-34
5118
5217
53-36
5419
5518
56-38

[1,0,-2,2,1,-4,3,2,-6,4,3,-8,5,4,-10,6,5,-12,7,6,
 -14,8,7,-16,9,8,-18,10,9,-20,11,10,-22,12,11,-24,
 13,12,-26,14,13,-28,15,14,-30,16,15,-32,17,16,-34,
 18,17,-36,19,18,-38]