G.f. A(x) satisfies: A(A(A(A(A(x))))) = G(x) where G(x) = x + 4*x^2 + x*G(G(G(G(G(x))))) is the g.f. of A215118.
A215119
G.f. A(x) satisfies: A(A(A(A(A(x))))) = G(x) where G(x) = x + 4*x^2 + x*G(G(G(G(G(x))))) is the g.f. of A215118.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =101a(4) =2301a(5) =82601a(6) =3287001a(7) =149411501a(8) =7474902101a(9) =406765054801
External references
- oeis: A215119