a(n) = A212392(n) / n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =14a(4) =80a(5) =516a(6) =3608a(7) =26729a(8) =206808a(9) =1655232a(10) =13612512a(11) =114466491a(12) =980575020a(13) =8533242324a(14) =75267759072a(15) =671721353474