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A028781 as a simple table

na(n)
12
23
35
46
57
610
711
812
914
1015
1118
1219
1320
1422
1523
1624
1726
1827
1928
2029
2130
2231
2334
2435
2537
2638
2739
2840
2941
3042
3143
3244
3345
3446
3547
3648
3750
3851
3954
4055
4156
4257
4358
4459
4561
4662
4763
4865
4966
5067

[2,3,5,6,7,10,11,12,14,15,18,19,20,22,23,24,26,27,
 28,29,30,31,34,35,37,38,39,40,41,42,43,44,45,46,
 47,48,50,51,54,55,56,57,58,59,61,62,63,65,66,67]