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A291272 as a simple table

na(n)
21
31
42
50
63
72
84
93
105
113
126
133
147
155
168
174
189
195
2010
217
2211
236
2412
255
2613
279
2814
297
3015
318
3216
3311
3417
3510
3618
379
3819
3913
4020
4110
4221
4311
4422
4515
4623
4712
4824
4914
5025
5117
5226
5313
5427
5515
5628
5719
5829
5915
6030
6115
6231
6321
6432
6515
6633
6717
6834
6923
7035

[1,1,2,0,3,2,4,3,5,3,6,3,7,5,8,4,9,5,10,7,11,6,12,
 5,13,9,14,7,15,8,16,11,17,10,18,9,19,13,20,10,21,
 11,22,15,23,12,24,14,25,17,26,13,27,15,28,19,29,
 15,30,15,31,21,32,15,33,17,34,23,35]