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A020990 as a simple table

na(n)
01
10
21
32
43
52
61
70
81
90
101
112
121
132
143
154
165
174
185
196
207
216
225
234
243
254
263
272
283
292
301
310
321
330
341
352
363
372
381
390
401
410
421
432
441
452
463
474
483
494
503
512
521
532
543
554
565
574
585
596
605
616
627
638
649
658
669
6710
6811
6910
709
718
729
738
749
7510
769
7710
7811

[1,0,1,2,3,2,1,0,1,0,1,2,1,2,3,4,5,4,5,6,7,6,5,4,
 3,4,3,2,3,2,1,0,1,0,1,2,3,2,1,0,1,0,1,2,1,2,3,4,3,
 4,3,2,1,2,3,4,5,4,5,6,5,6,7,8,9,8,9,10,11,10,9,8,
 9,8,9,10,9,10,11]