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

A350456

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =1a(5) =-3a(6) =17a(7) =-85a(8) =385a(9) =-1767a(10) =8929a(11) =-50633a(12) =312705a(13) =-2036267a(14) =13794417a(15) =-97295069a(16) =717808897a(17) =-5549714767a(18) =44868094145a(19) =-377741383697

External references