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A188590 as a simple table

na(n)
13
23
34
43
53
64
73
83
94
103
113
123
134
143
153
164
173
183
194
203
213
223
234
243
253
264
273
283
294
303
313
323
334
343
353
364
373
383
394
403
413
424
433
443
453
464
473
483
494
503
513
524
533
543
553
564
573
583
594
603
613
624
633
643
653
664
673
683
694
703
713
724
733
743
754
763

[3,3,4,3,3,4,3,3,4,3,3,3,4,3,3,4,3,3,4,3,3,3,4,3,
 3,4,3,3,4,3,3,3,4,3,3,4,3,3,4,3,3,4,3,3,3,4,3,3,4,
 3,3,4,3,3,3,4,3,3,4,3,3,4,3,3,3,4,3,3,4,3,3,4,3,3,
 4,3]