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A006386 as a simple table

na(n)
21
36
446
5452
64852
752972
8587047
96550808
1073483256
11827801468
129360123740
13106189359544
141208328304864
1513787042250528
16157700137398689
171807893066408464
1820768681225892328
19239037464947999900

[1,6,46,452,4852,52972,587047,6550808,73483256,
 827801468,9360123740,106189359544,1208328304864,
 13787042250528,157700137398689,1807893066408464,
 20768681225892328,239037464947999900]