G.f. A(x) satisfies: [x^(n+1)] A(F^n(x)) = 0 for n>0 where F^n(x) denotes the n-th iteration of F(x) = x+x^2 with F^0(x)=x.

A187009

G.f. A(x) satisfies: [x^(n+1)] A(F^n(x)) = 0 for n>0 where F^n(x) denotes the n-th iteration of F(x) = x+x^2 with F^0(x)=x.

Terms

    a(0) =1a(1) =-1a(2) =2a(3) =-6a(4) =20a(5) =-80a(6) =348a(7) =-1778a(8) =9892a(9) =-64392a(10) =449596a(11) =-3609782a(12) =30152616a(13) =-284037468a(14) =2694480888a(15) =-28592860322a(16) =295151311376

External references