G.f. A(x) satisfies: A(x) = 1 / (1 + x - 2 * x * A(-4*x)).

A349046

G.f. A(x) satisfies: A(x) = 1 / (1 + x - 2 * x * A(-4*x)).

Terms

    a(0) =1a(1) =1a(2) =-7a(3) =-239a(4) =30185a(5) =15518977a(6) =-31752293287

External references