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A245690 as a simple table

na(n)
31
41
51
61
71
81
91
102
111
121
131
141
151
161
171
181
191
201
211
222
231
241
251
261
271
281
291
303
311
321
331
342
351
361
371
381
391
401
411
421
431
441
451
462
471
481
491
502
511
521
531
541
551
561
571
582
591
603
611
621
631
641
651
661
671
681
691
702
711
721
731
741
751

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