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A047252 as a simple table

na(n)
10
21
33
44
55
66
77
89
910
1011
1112
1213
1315
1416
1517
1618
1719
1821
1922
2023
2124
2225
2327
2428
2529
2630
2731
2833
2934
3035
3136
3237
3339
3440
3541
3642
3743
3845
3946
4047
4148
4249
4351
4452
4553
4654
4755
4857
4958
5059
5160
5261
5363
5464
5565
5666
5767
5869
5970
6071
6172
6273
6375
6476
6577
6678
6779

[0,1,3,4,5,6,7,9,10,11,12,13,15,16,17,18,19,21,22,
 23,24,25,27,28,29,30,31,33,34,35,36,37,39,40,41,
 42,43,45,46,47,48,49,51,52,53,54,55,57,58,59,60,
 61,63,64,65,66,67,69,70,71,72,73,75,76,77,78,79]