G.f. satisfies: A(x) = 1 + x*A(x)^2*A(2x)^2.

A168603

G.f. satisfies: A(x) = 1 + x*A(x)^2*A(2x)^2.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =73a(4) =1578a(5) =60582a(6) =4276284a(7) =574950725a(8) =150783454338

External references