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A121997 as a simple table

na(n)
11
21
32
41
52
61
72
83
91
102
113
121
132
143
151
162
173
184
191
202
213
224
231
242
253
264
271
282
293
304
311
322
333
344
355
361
372
383
394
405
411
422
433
444
455
461
472
483
494
505
511
522
533
544
555
561
572
583
594
605
616
621
632
643
654
665
676
681
692
703
714
725
736
741
752
763
774
785
796
801
812
823
834
845
856
861
872
883
894
905
916
921
932
943
954
965
976
987
991
1002
1013
1024
1035
1046
1057

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