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A028766 as a simple table

na(n)
12
23
35
48
512
614
718
819
920
1021
1122
1223
1326
1427
1530
1631
1732
1833
1934
2035
2139
2241
2345
2448
2550
2651

[2,3,5,8,12,14,18,19,20,21,22,23,26,27,30,31,32,
 33,34,35,39,41,45,48,50,51]