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A072720 as a simple table

na(n)
01
11
22
33
45
56
610
711
815
917
1023
1124
1234
1335
1443
1547
1657
1758
1873
1974
2091
2196
22112
23113
24139
25141
26163
27168
28197
29198
30235
31236
32272
33279
34317
35321
36378
37379
38427
39436
40501
41502
42575
43576
44653
45666
46742
47743
48851
49853
50952
51963
521080
531081
541211
551216
561361

[1,1,2,3,5,6,10,11,15,17,23,24,34,35,43,47,57,58,
 73,74,91,96,112,113,139,141,163,168,197,198,235,
 236,272,279,317,321,378,379,427,436,501,502,575,
 576,653,666,742,743,851,853,952,963,1080,1081,
 1211,1216,1361]