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A184347 as a simple table

na(n)
11
21
32
42
58
647
7124
81371
95439
1034449
11189065
12862990
135437663
1423939996
15139734236

[1,1,2,2,8,47,124,1371,5439,34449,189065,862990,
 5437663,23939996,139734236]