a(n) = A078218(n)/n.

Terms

a(0) =1a(1) =6a(2) =44a(3) =31a(4) =3a(5) =206a(6) =25a(7) =156a(8) =155a(9) =1251a(10) =101a(11) =1028844a(12) =87a(13) =9082a(14) =901a(15) =7801a(16) =69a(17) =687177a(18) =63a(19) =622551a(20) =6534a(21) =550555a(22) =535a(23) =51445051a(24) =61a(25) =46664a(26) =51582a(27) =44540815a(28) =445a(29) =411870051