257973

Appears in sequences

• a(n) = (1/n!)*A001688(n).at n=21A094793
• 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.at n=6A193206