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A306571 as a simple table

na(n)
01
13
24
34
43
52
63
76
87
95
104
114
126
137
147
156
166
176
186
195
204
218
229
236
243
254
264
276
287
297
306
318
325
335
344
358
3610
379
385
395
405
415
428
4310
4410
459
468
477
489
499
507
518
528
537
547
556
567
5712
5812
598
602
613
626
6311
649
658
669
677
682
694
705
718
7213
7314
748
756
766
778
789
799
8011
818
827
837
8410
859
8610
8711
888
897
909
9111
9213
9311
948
955
966
977
9810
9910
10013

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