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A028813 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1013
1114
1215
1317
1418
1519
1620
1722
1823
1926
2027
2128
2230
2331
2432
2533
2634
2735
2837
2938
3039
3140
3242
3343
3445
3546
3647
3748
3850
3951
4052
4153
4254
4355
4457
4558
4659
4760
4862
4963
5065
5166
5267
5368
5470
5571
5672
5773
5874
5975
6077
6178
6279
6380
6482
6583
6685
6786
6887
6988
7090
7191
7292
7393
7494
7595
7697
7798
7899

[2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,20,22,23,
 26,27,28,30,31,32,33,34,35,37,38,39,40,42,43,45,
 46,47,48,50,51,52,53,54,55,57,58,59,60,62,63,65,
 66,67,68,70,71,72,73,74,75,77,78,79,80,82,83,85,
 86,87,88,90,91,92,93,94,95,97,98,99]