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A028806 as a simple table

na(n)
12
23
35
46
58
611
712
813
914
1015
1117
1220
1321
1422
1523
1624
1726
1827
1929
2030
2132
2234
2335
2437
2538
2641
2742
2843
2944
3046
3147
3248
3350
3452
3553
3654
3755
3856
3957
4058
4159
4260
4361
4462
4565
4668
4771
4873
4974
5075
5177
5279
5380
5483
5584
5685
5786
5888
5989
6091
6192

[2,3,5,6,8,11,12,13,14,15,17,20,21,22,23,24,26,27,
 29,30,32,34,35,37,38,41,42,43,44,46,47,48,50,52,
 53,54,55,56,57,58,59,60,61,62,65,68,71,73,74,75,
 77,79,80,83,84,85,86,88,89,91,92]