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A123508 as a simple table

na(n)
01
13
21
33
42
53
61
73
82
92
103
111
123
132
143
151
163
172
182
193
202
213
221
233
242
253
261
273
282
292
303
311
323
332
343
351
363
372
382
393
402
413
421
433
442
452
463
471
483
492
503
511
523
532
542
553

[1,3,1,3,2,3,1,3,2,2,3,1,3,2,3,1,3,2,2,3,2,3,1,3,
 2,3,1,3,2,2,3,1,3,2,3,1,3,2,2,3,2,3,1,3,2,2,3,1,3,
 2,3,1,3,2,2,3]