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A307081 as a simple table

na(n)
11
21
32
41
53
62
71
83
92
104
111
125
133
142
154
161
175
183
192
204
216
221
237
245
253
262
274
286
291
307
315
323
332
344
356
368
371
387
395
403
419
422
434
446
458
461
477
485
493
509
512
5210
534
546
558
561
5711
587
595
603
619
622
6310
644
656
668
671
6811
697
705
713
729
732
7410
754
766
778
7812
791
8013
8111
827
835
843
859
862
8710
884
896
908
9112

[1,1,2,1,3,2,1,3,2,4,1,5,3,2,4,1,5,3,2,4,6,1,7,5,
 3,2,4,6,1,7,5,3,2,4,6,8,1,7,5,3,9,2,4,6,8,1,7,5,3,
 9,2,10,4,6,8,1,11,7,5,3,9,2,10,4,6,8,1,11,7,5,3,9,
 2,10,4,6,8,12,1,13,11,7,5,3,9,2,10,4,6,8,12]