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A067280 as a simple table

na(n)
11
22
33
41
52
63
75
83
91
102
113
123
136
145
153
161
172
183
197
203
217
227
235
243
251
262
273
285
296
303
319
325
335
345
353
361
372
383
393
403
414
423
4311
449
457
4613
475
483
491
502
513
527
536
547
555
563
577
588
597
605
6112
625
633
641
652
663
6711
683
699
707
719
723
738
746
755
7613
777
785
795
803
811
822
833
843
856
8611
873
887
896
903
919
929
9311
9417
955
965
9712
985

[1,2,3,1,2,3,5,3,1,2,3,3,6,5,3,1,2,3,7,3,7,7,5,3,
 1,2,3,5,6,3,9,5,5,5,3,1,2,3,3,3,4,3,11,9,7,13,5,3,
 1,2,3,7,6,7,5,3,7,8,7,5,12,5,3,1,2,3,11,3,9,7,9,3,
 8,6,5,13,7,5,5,3,1,2,3,3,6,11,3,7,6,3,9,9,11,17,5,
 5,12,5]