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A047573 as a simple table

na(n)
10
21
32
44
55
66
77
88
99
1010
1112
1213
1314
1415
1516
1617
1718
1820
1921
2022
2123
2224
2325
2426
2528
2629
2730
2831
2932
3033
3134
3236
3337
3438
3539
3640
3741
3842
3944
4045
4146
4247
4348
4449
4550
4652
4753
4854
4955
5056
5157
5258
5360
5461
5562
5663
5764
5865
5966
6068
6169
6270
6371
6472
6573
6674
6776
6877
6978
7079
7180
7281

[0,1,2,4,5,6,7,8,9,10,12,13,14,15,16,17,18,20,21,
 22,23,24,25,26,28,29,30,31,32,33,34,36,37,38,39,
 40,41,42,44,45,46,47,48,49,50,52,53,54,55,56,57,
 58,60,61,62,63,64,65,66,68,69,70,71,72,73,74,76,
 77,78,79,80,81]