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A111901 as a simple table

na(n)
01
10
21
31
42
52
63
74
85
97
108
1111
1213
1317
1420
1525
1630
1737
1844
1953
2063
2175
2289
23105
24123
25145
26169
27197
28229
29266
30307
31355
32408
33469
34538
35615
36703
37801
38912
391035
401175
411330
421504
431698
441914
452155
462423
472721
483051
493418
503824
514273
524770
535319
545925

[1,0,1,1,2,2,3,4,5,7,8,11,13,17,20,25,30,37,44,53,
 63,75,89,105,123,145,169,197,229,266,307,355,408,
 469,538,615,703,801,912,1035,1175,1330,1504,1698,
 1914,2155,2423,2721,3051,3418,3824,4273,4770,5319,
 5925]