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A131870 as a simple table

na(n)
01
12
23
34
46
57
68
79
81
92
103
114
126
137
148
159
161
172
183
194
206
217
228
239
241
252
263
274
286
297
308
319
321
332
343
354
366
377
388
399
401
412
423
434
446
457
468
479
481
492
503
514
526
537
548
559
561
572
583
594
606
617
628
639
641
652
663
674
686
697
708
719
721
732
743
754
766
777
788
799
801
812
823
834
846
857
868
879
881
892
903
914
926
937
948
959
961
972
983
994
1006
1017
1028
1039
1041

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