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A087724 as a simple table

na(n)
21
30
41
51
62
72
83
94
106
115
127
137
148
159
1611
1711
1812
1912
2013
2113
2215
2315
2417
2519
2619
2720
2821
2920
3021
3123
3224
3326
3426
3528
3629
3729
3830
3931
4032
4133
4233
4334
4435
4535
4635
4737
4840
4941
5041
5142
5243
5342
5444
5546
5647
5748
5848
5948
6049
6148
6250
6354
6454
6554
6655
6757
6858
6960
7061
7160
7261
7362
7463
7564

[1,0,1,1,2,2,3,4,6,5,7,7,8,9,11,11,12,12,13,13,15,
 15,17,19,19,20,21,20,21,23,24,26,26,28,29,29,30,
 31,32,33,33,34,35,35,35,37,40,41,41,42,43,42,44,
 46,47,48,48,48,49,48,50,54,54,54,55,57,58,60,61,
 60,61,62,63,64]