a(n) = A078217(n)/n.

Terms

a(0) =1a(1) =5a(2) =4a(3) =33a(4) =2468a(5) =25a(6) =176366a(7) =1697a(8) =13842a(9) =1379a(10) =11223344464a(11) =13093a(13) =9707938a(14) =8318740876a(15) =8486944572a(17) =87284065a(19) =689555658595