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A047251 as a simple table

na(n)
11
23
34
45
57
69
710
811
913
1015
1116
1217
1319
1421
1522
1623
1725
1827
1928
2029
2131
2233
2334
2435
2537
2639
2740
2841
2943
3045
3146
3247
3349
3451
3552
3653
3755
3857
3958
4059
4161
4263
4364
4465
4567
4669
4770
4871
4973
5075
5176
5277
5379
5481
5582
5683
5785
5887
5988
6089
6191
6293
6394
6495
6597
6699

[1,3,4,5,7,9,10,11,13,15,16,17,19,21,22,23,25,27,
 28,29,31,33,34,35,37,39,40,41,43,45,46,47,49,51,
 52,53,55,57,58,59,61,63,64,65,67,69,70,71,73,75,
 76,77,79,81,82,83,85,87,88,89,91,93,94,95,97,99]