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A137921 as a simple table

na(n)
11
21
32
42
52
62
72
83
93
103
112
123
132
143
154
164
172
184
192
204
214
223
232
245
253
263
274
285
292
305
312
325
334
343
354
366
372
383
394
406
412
425
432
445
456
463
472
487
493
505
514
525
532
546
554
566
574
583
592
607
612
623
636
646
654
666
672
685
694
707
712
728
732
743
756
765
774
786
792
808
815
823
832
848
854
863
874
887
892
908
914
925
934
943
954
969
972
985
996
1007
1012
1026
1032
1047
1058

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