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A047421 as a simple table

na(n)
00
11
22
33
44
55
66
78
89
910
1011
1112
1213
1314
1416
1517
1618
1719
1820
1921
2022
2124
2225
2326
2427
2528
2629
2730
2832
2933
3034
3135
3236
3337
3438
3540
3641
3742
3843
3944
4045
4146
4248
4349
4450
4551
4652
4753
4854
4956
5057
5158
5259
5360
5461
5562
5664
5765
5866
5967
6068
6169
6270
6372
6473
6574
6675

[0,1,2,3,4,5,6,8,9,10,11,12,13,14,16,17,18,19,20,
 21,22,24,25,26,27,28,29,30,32,33,34,35,36,37,38,
 40,41,42,43,44,45,46,48,49,50,51,52,53,54,56,57,
 58,59,60,61,62,64,65,66,67,68,69,70,72,73,74,75]