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

A379194

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

Terms

    a(0) =1a(1) =3a(2) =19a(3) =174a(4) =1883a(5) =22323a(6) =280409a(7) =3666736a(8) =49386326a(9) =680431419a(10) =9544684113a(11) =135852904486

External references