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A051237 as a simple table

na(n)
11
21
32
41
52
63
71
82
93
104
111
124
133
142
155
161
174
183
192
205
216
221
234
243
252
265
276
287
291
302
313
324
337
346
355
368
371
382
393
404
417
426
435
448
459
461
472
483
494
507
516
525
538
549
5510
561
572
583
594
607
6110
629
638
645
656
6611
671
682
693
704
717
7210
739
748
755
766
7711
7812
791
802
813
824
837
846
855
8612
8711
888
899
9010
9113
921
932
943
954
967
976
9813
9910

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