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A087818 as a simple table

na(n)
11
21
33
42
51
63
72
81
94
103
117
122
135
141
153
169
172
185
194
201
213
227
236
2411
252
264
271
287
293
306
315
322
339
344
357
361
373
385
399
402
418
424
437
441
456
463
4710
489
495
508
512
524
5312
5411
551
563
579
585
598
6019
612
6212
637
644
6510
666
671
689
693
7014
715
7212
7321
742
757
764
7710
786
799
801
813
828
835
8411
8523
862
8710
884
8915
9014
916
9213
931
943
958
965
9711

[1,1,3,2,1,3,2,1,4,3,7,2,5,1,3,9,2,5,4,1,3,7,6,11,
 2,4,1,7,3,6,5,2,9,4,7,1,3,5,9,2,8,4,7,1,6,3,10,9,
 5,8,2,4,12,11,1,3,9,5,8,19,2,12,7,4,10,6,1,9,3,14,
 5,12,21,2,7,4,10,6,9,1,3,8,5,11,23,2,10,4,15,14,6,
 13,1,3,8,5,11]