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A186975 as a simple table

na(n)
11
21
32
41
53
64
71
83
94
101
115
1210
1312
141
153
164
171
187
1918
2026
2128
221
235
2411
2515
2616
271
287
2919
3029
3132
321
335
3410
3512
361
3711
3842
3984
40110
41116
421
435
4411
4515
4616
471
4813
4958
50137
51209
52242
53248
541
557
5621
5737
5846
5948
601
619
6230
6355
6469
6572
661
679
6833
6969
7098
71110
72112

[1,1,2,1,3,4,1,3,4,1,5,10,12,1,3,4,1,7,18,26,28,1,
 5,11,15,16,1,7,19,29,32,1,5,10,12,1,11,42,84,110,
 116,1,5,11,15,16,1,13,58,137,209,242,248,1,7,21,
 37,46,48,1,9,30,55,69,72,1,9,33,69,98,110,112]