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A028801 as a simple table

na(n)
12
23
35
46
57
68
710
811
913
1014
1115
1217
1318
1419
1521
1622
1723
1824
1926
2027
2128
2229
2330
2431
2532
2634
2735
2837
2938
3039
3140
3241
3342
3443
3545
3646
3747
3850
3951
4052
4153
4254
4355
4457
4558
4659
4761
4862
4963
5065
5166
5267
5368
5469
5570
5671
5772
5873
5974
6075
6176
6277
6378
6479
6582
6683
6784
6885
6986
7087

[2,3,5,6,7,8,10,11,13,14,15,17,18,19,21,22,23,24,
 26,27,28,29,30,31,32,34,35,37,38,39,40,41,42,43,
 45,46,47,50,51,52,53,54,55,57,58,59,61,62,63,65,
 66,67,68,69,70,71,72,73,74,75,76,77,78,79,82,83,
 84,85,86,87]