G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n * (Sum_{k>=0} C(n+k-1,k)^2*x^k), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.
A193206
G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n * (Sum_{k>=0} C(n+k-1,k)^2*x^k), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =21a(4) =293a(5) =7025a(6) =257973a(7) =13401901a(8) =932658707a(9) =83605059701
External references
- oeis: A193206