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A120521 as a simple table

na(n)
11
25
36
47
512
613
714
815
917
1018
1119
1220
1322
1423
1524
1625
1731
1832
1933
2034
2136
2237
2338
2439
2541
2642
2743
2844
2946
3047
3148
3249
3352
3453
3554
3655
3757
3858
3959
4060
4162
4263
4364
4465
4567
4668
4769
4870
4973
5074

[1,5,6,7,12,13,14,15,17,18,19,20,22,23,24,25,31,
 32,33,34,36,37,38,39,41,42,43,44,46,47,48,49,52,
 53,54,55,57,58,59,60,62,63,64,65,67,68,69,70,73,
 74]