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A158974 as a simple table

na(n)
10
20
30
40
51
60
72
81
93
103
115
121
136
145
156
166
179
186
1910
207
2110
2211
2313
247
2514
2614
2715
2814
2918
3012
3119
3216
3319
3420
3521
3616
3724
3823
3924
4020
4127
4222
4328
4425
4525
4629
4731
4823
4932
5030
5133
5232
5336
5431
5536
5632
5738
5839
5941
6031
6142
6241
6339
6440
6544
6641
6747
6844
6947
7043
7150
7240
7351
7450
7549
7650

[0,0,0,0,1,0,2,1,3,3,5,1,6,5,6,6,9,6,10,7,10,11,
 13,7,14,14,15,14,18,12,19,16,19,20,21,16,24,23,24,
 20,27,22,28,25,25,29,31,23,32,30,33,32,36,31,36,
 32,38,39,41,31,42,41,39,40,44,41,47,44,47,43,50,
 40,51,50,49,50]