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A047513 as a simple table

na(n)
10
21
32
44
56
67
78
89
910
1012
1114
1215
1316
1417
1518
1620
1722
1823
1924
2025
2126
2228
2330
2431
2532
2633
2734
2836
2938
3039
3140
3241
3342
3444
3546
3647
3748
3849
3950
4052
4154
4255
4356
4457
4558
4660
4762
4863
4964
5065
5166
5268
5370
5471
5572
5673
5774
5876
5978
6079
6180
6281
6382
6484
6586
6687
6788

[0,1,2,4,6,7,8,9,10,12,14,15,16,17,18,20,22,23,24,
 25,26,28,30,31,32,33,34,36,38,39,40,41,42,44,46,
 47,48,49,50,52,54,55,56,57,58,60,62,63,64,65,66,
 68,70,71,72,73,74,76,78,79,80,81,82,84,86,87,88]