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A173989 as a simple table

na(n)
10
20
31
41
52
61
73
83
94
103
115
125
136
145
157
167
178
187
199
209
2110
229
2311
2411
2512
2611
2713
2813
2914
3013
3115
3215
3316
3415
3517
3617
3718
3817
3919
4019
4120
4219
4321
4421
4522
4621
4723
4823
4924
5023
5125
5225
5326
5425
5527
5627
5728
5827
5929
6029
6130
6229
6331
6431
6532
6631
6733
6833
6934
7033
7135
7235
7336
7435
7537
7637
7738
7837

[0,0,1,1,2,1,3,3,4,3,5,5,6,5,7,7,8,7,9,9,10,9,11,
 11,12,11,13,13,14,13,15,15,16,15,17,17,18,17,19,
 19,20,19,21,21,22,21,23,23,24,23,25,25,26,25,27,
 27,28,27,29,29,30,29,31,31,32,31,33,33,34,33,35,
 35,36,35,37,37,38,37]