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A028767 as a simple table

na(n)
12
23
35
46
58
611
712
814
915
1017
1118
1220
1321
1423
1524
1626
1729
1830
1932
2033
2135
2238
2339
2441
2542
2644
2745
2847
2948
3050
3151
3253

[2,3,5,6,8,11,12,14,15,17,18,20,21,23,24,26,29,30,
 32,33,35,38,39,41,42,44,45,47,48,50,51,53]