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A002331 as a simple table

na(n)
11
21
32
41
52
61
74
82
95
103
115
124
131
143
157
164
177
186
192
209
217
221
232
248
254
261
2710
289
295
302
3112
3211
339
345
358
367
3710
386
391
403
4114
4212
437
444
4510
465
4711
4810
4914
5013
511
528
535
5417
5516
564
5713
586
5912
601
615
6215
632
649
6519
6612
6717
6811
695
7014
7110
7218
734
746
7516
7620
7719
7810
7913
804
816
8215
8322
8411
853
865

[1,1,2,1,2,1,4,2,5,3,5,4,1,3,7,4,7,6,2,9,7,1,2,8,
 4,1,10,9,5,2,12,11,9,5,8,7,10,6,1,3,14,12,7,4,10,
 5,11,10,14,13,1,8,5,17,16,4,13,6,12,1,5,15,2,9,19,
 12,17,11,5,14,10,18,4,6,16,20,19,10,13,4,6,15,22,
 11,3,5]