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A290491 as a simple table

na(n)
12
22
32
41
52
63
72
82
92
101
113
124
133
142
153
165
173
181
194
203
213
224
233
242
252
265
275
281
293
302
314
323
333
343
352
366
373
382
391
403
416
424
432
442
453
465
473
483
491
502
514
523
534
542
555
564
575
585
593
602
617
624
634
643
652
666
673
684
694
703
719
723
732
743
753
766
775
784
794
803
818
825
832
842
853
866
873
883
894
904
915
927
932
943
953
968
976
981
995
1004

[2,2,2,1,2,3,2,2,2,1,3,4,3,2,3,5,3,1,4,3,3,4,3,2,
 2,5,5,1,3,2,4,3,3,3,2,6,3,2,1,3,6,4,2,2,3,5,3,3,1,
 2,4,3,4,2,5,4,5,5,3,2,7,4,4,3,2,6,3,4,4,3,9,3,2,3,
 3,6,5,4,4,3,8,5,2,2,3,6,3,3,4,4,5,7,2,3,3,8,6,1,5,
 4]