G.f. A(x) satisfies: [x^(n+3)] 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.

A187124

G.f. A(x) satisfies: [x^(n+3)] 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) =-3a(2) =6a(3) =-18a(4) =48a(5) =-195a(6) =549a(7) =-3465a(8) =7452a(9) =-112707a(10) =-5994a(11) =-6866904a(12) =-25659292a(13) =-700243362a(14) =-5594278734a(15) =-106900155574

External references