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A026238 as a simple table

na(n)
21
32
41
53
62
74
83
94
105
115
126
136
147
158
169
177
1810
198
2011
2112
2213
239
2414
2515
2616
2717
2818
2910
3019
3111
3220
3321
3422
3523
3624
3712
3825
3926
4027
4113
4228
4314
4429
4530
4631
4715
4832
4933
5034
5135
5236
5316
5437
5538
5639
5740
5841
5917
6042
6118
6243
6344
6445
6546
6647
6719

[1,2,1,3,2,4,3,4,5,5,6,6,7,8,9,7,10,8,11,12,13,9,
 14,15,16,17,18,10,19,11,20,21,22,23,24,12,25,26,
 27,13,28,14,29,30,31,15,32,33,34,35,36,16,37,38,
 39,40,41,17,42,18,43,44,45,46,47,19]