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A026409 as a simple table

na(n)
11
22
33
42
54
63
75
86
93
104
117
125
138
144
156
169
175
184
197
2010
216
225
238
2411
259
267
275
286
2912
3010
318
3213
337
346
359
3611
3714
3815
398
406
417
4210
4312
449
4513
4616
478
487
4911
5017
5114
5210
539
5415
557
568
5712
5813
5918
6011
6119
629
6310
648
6514
6616
6717
6820
6912
7015
719
728
7310
7411
7513

[1,2,3,2,4,3,5,6,3,4,7,5,8,4,6,9,5,4,7,10,6,5,8,
 11,9,7,5,6,12,10,8,13,7,6,9,11,14,15,8,6,7,10,12,
 9,13,16,8,7,11,17,14,10,9,15,7,8,12,13,18,11,19,9,
 10,8,14,16,17,20,12,15,9,8,10,11,13]