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A010412 as a simple table

na(n)
10
21
34
49
513
615
716
818
919
1021
1125
1230
1333
1434
1536
1642
1743
1849

[0,1,4,9,13,15,16,18,19,21,25,30,33,34,36,42,43,
 49]