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A120519 as a simple table

na(n)
11
23
34
45
58
69
710
811
913
1014
1115
1216
1318
1419
1520
1621
1725
1826
1927
2028
2130
2231
2332
2433
2535
2636
2737
2838
2940
3041
3142
3243
3346
3447
3548
3649
3751
3852
3953
4054
4156
4257
4358
4459
4561
4662
4763
4864
4967
5068

[1,3,4,5,8,9,10,11,13,14,15,16,18,19,20,21,25,26,
 27,28,30,31,32,33,35,36,37,38,40,41,42,43,46,47,
 48,49,51,52,53,54,56,57,58,59,61,62,63,64,67,68]