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A166871 as a simple table

na(n)
00
11
22
33
4-1
5-2
64
75
86
9-3
10-4
117
128
139
14-5
15-6
1610
1711
1812
19-7
20-8
2113
2214
2315
24-9
25-10
2616
2717
2818
29-11
30-12
3119
3220
3321
34-13
35-14
3622
3723
3824
39-15
40-16
4125
4226
4327
44-17
45-18
4628
4729
4830
49-19
50-20
5131
5232
5333
54-21
55-22
5634
5735
5836
59-23
60-24
6137
6238
6339
64-25
65-26
6640
6741

[0,1,2,3,-1,-2,4,5,6,-3,-4,7,8,9,-5,-6,10,11,12,
 -7,-8,13,14,15,-9,-10,16,17,18,-11,-12,19,20,21,
 -13,-14,22,23,24,-15,-16,25,26,27,-17,-18,28,29,
 30,-19,-20,31,32,33,-21,-22,34,35,36,-23,-24,37,
 38,39,-25,-26,40,41]