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A028804 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1013
1115
1217
1318
1419
1520
1621
1724
1826
1927
2028
2131
2232
2333
2434
2537
2638
2740
2841
2944
3045
3146
3247
3348
3450
3552
3654
3755
3857
3958
4059
4160
4261
4362
4463
4566
4667
4768
4869
4970
5071
5172
5273
5375
5476
5580
5682
5783
5884
5985
6086
6187
6289
6390

[2,3,5,6,7,8,10,11,12,13,15,17,18,19,20,21,24,26,
 27,28,31,32,33,34,37,38,40,41,44,45,46,47,48,50,
 52,54,55,57,58,59,60,61,62,63,66,67,68,69,70,71,
 72,73,75,76,80,82,83,84,85,86,87,89,90]