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A031045 as a simple table

na(n)
00
11
22
33
44
55
66
77
80
91
101
111
122
131
143
151
164
171
185
191
206
211
227
231
240
252
261
272
282
292
303
312
324
332
345
352
366
372
387
392
400
413
421
433
442
453
463
473
484
493
505
513
526
533
547
553
560
574
581
594
602
614
623
634
644
654
665
674
686
694
707
714
720
735
741
755
762
775
783
795
804
815
825
835
846
855
867
875
880
896
901

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