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A047549 as a simple table

na(n)
10
21
32
43
54
67
78
89
910
1011
1112
1215
1316
1417
1518
1619
1720
1823
1924
2025
2126
2227
2328
2431
2532
2633
2734
2835
2936
3039
3140
3241
3342
3443
3544
3647
3748
3849
3950
4051
4152
4255
4356
4457
4558
4659
4760
4863
4964
5065
5166
5267
5368
5471
5572
5673
5774
5875
5976
6079
6180
6281
6382
6483
6584
6687
6788

[0,1,2,3,4,7,8,9,10,11,12,15,16,17,18,19,20,23,24,
 25,26,27,28,31,32,33,34,35,36,39,40,41,42,43,44,
 47,48,49,50,51,52,55,56,57,58,59,60,63,64,65,66,
 67,68,71,72,73,74,75,76,79,80,81,82,83,84,87,88]