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A071980 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1011
1113
1215
1317
1419
1521
1623
1725
1827
1929
2022
2124
2226
2328
2430
2532
2634
2736
2838
2940
3033
3135
3237
3339
3441
3543
3645
3747
3849
3951
4044
4146
4248
4350
4452
4554
4656
4758
4860
4962
5055
5157
5259
5361
5463
5565
5667
5769
5871
5973
6066
6168
6270
6372
6474
6576
6678
6780
6882
6984
7077
7179

[0,1,2,3,4,5,6,7,8,9,11,13,15,17,19,21,23,25,27,
 29,22,24,26,28,30,32,34,36,38,40,33,35,37,39,41,
 43,45,47,49,51,44,46,48,50,52,54,56,58,60,62,55,
 57,59,61,63,65,67,69,71,73,66,68,70,72,74,76,78,
 80,82,84,77,79]