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A020756 as a simple table

na(n)
10
21
32
43
54
66
77
89
910
1011
1112
1213
1315
1416
1518
1620
1721
1822
1924
2025
2127
2228
2329
2430
2531
2634
2736
2837
2938
3039
3142
3243
3345
3446
3548
3649
3751
3855
3956
4057
4158
4260
4361
4464
4565
4666
4767
4869
4970
5072
5173
5276
5378
5479
5581
5683
5784
5887
5988
6090
6191
6292
6393
6494
6597
6699
67100
68101
69102
70105
71106
72108

[0,1,2,3,4,6,7,9,10,11,12,13,15,16,18,20,21,22,24,
 25,27,28,29,30,31,34,36,37,38,39,42,43,45,46,48,
 49,51,55,56,57,58,60,61,64,65,66,67,69,70,72,73,
 76,78,79,81,83,84,87,88,90,91,92,93,94,97,99,100,
 101,102,105,106,108]