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A172993 as a simple table

na(n)
10
20
30
41
51
61
72
82
93
105
116
129
139
1411
1513
1615
1717
1818
1920
2023

[0,0,0,1,1,1,2,2,3,5,6,9,9,11,13,15,17,18,20,23]