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A331971 as a simple table

na(n)
20
30
40
50
61
71
82
91
102
112
122
132
142
152
162
173
181
192
201
213
222
233
241
253
261
273
282
294
301
316
321
334
342
354
362
375
380
393
401
414
422
435
441
454
462
474
481
496
502
515
522
535
542
558
561
576
581
594
602
617
621
635
643
655
662
678
680
695
701
716
721
738
742
755
763
776
783
799
800
816
822
835
841
859
861
877
881

[0,0,0,0,1,1,2,1,2,2,2,2,2,2,2,3,1,2,1,3,2,3,1,3,
 1,3,2,4,1,6,1,4,2,4,2,5,0,3,1,4,2,5,1,4,2,4,1,6,2,
 5,2,5,2,8,1,6,1,4,2,7,1,5,3,5,2,8,0,5,1,6,1,8,2,5,
 3,6,3,9,0,6,2,5,1,9,1,7,1]