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A128881 as a simple table

na(n)
18
21
31
42
52
62
73
83
94
104
114
125
135
146
156
166
177
187
198
208
218
229
239
240
250
261
278
281
291
306
311
321
334
342
351
362
373
381
390
404
411
428
435
441
456
465
471
484
496
501
512
527
531
540
558
561
578
589
591
606
619
622
634
640
652
662
671
682
690
702
712
728
733
742
756
763
772
784
794
802
812
825
832
840
856
862
878
887
892
906
917
922
934
948
952
962
979
982
990
1000
1013
1028
1031
1043
1056

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