G.f. A(x) satisfies A(x) = (1 + x*A(x)/(1 - x*A(x))^2)^3.

A365134

G.f. A(x) satisfies A(x) = (1 + x*A(x)/(1 - x*A(x))^2)^3.

Terms

    a(0) =1a(1) =3a(2) =18a(3) =130a(4) =1041a(5) =8889a(6) =79310a(7) =730593a(8) =6895575a(9) =66337179a(10) =648087750a(11) =6412437474a(12) =64125877361a(13) =647102364990

External references