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A227687 as a simple table

na(n)
11
21
32
41
52
61
73
82
91
104
112
123
131
143
152
163
171
183
192
203
211
225
233
242
253
261
275
283
292
303
315
321
334
343
352
363
375
381
394
403
412
423
434
441
456
464
473
482
493
505
511
526
534
543
552
563
574
587
591
605
613
625
632
643
654
667
671
685
694
703
712
723
734
746
751
767
774
783
795
802
813
824
836
841
858
865

[1,1,2,1,2,1,3,2,1,4,2,3,1,3,2,3,1,3,2,3,1,5,3,2,
 3,1,5,3,2,3,5,1,4,3,2,3,5,1,4,3,2,3,4,1,6,4,3,2,3,
 5,1,6,4,3,2,3,4,7,1,5,3,5,2,3,4,7,1,5,4,3,2,3,4,6,
 1,7,4,3,5,2,3,4,6,1,8,5]