G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n * (Sum_{k=0..n} C(n,k)^2*x^k), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.
A193205
G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n * (Sum_{k=0..n} C(n,k)^2*x^k), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =76a(5) =1452a(6) =45612a(7) =2095992a(8) =131601136a(9) =10790109464
External references
- oeis: A193205