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

A348861

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =9a(4) =253a(5) =20754a(6) =5064301a(7) =3696964686

External references