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A066634 as a simple table

na(n)
55
616
742
8138
9357
101233
113278
1212589
1335789
14159613
15499900
162677865
179421400
1862226044

[5,16,42,138,357,1233,3278,12589,35789,159613,
 499900,2677865,9421400,62226044]