G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^n * Sum_{k=0..n} binomial(n,k)^2 * x^k*(1-x)^(n-k).

A227824

G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^n * Sum_{k=0..n} binomial(n,k)^2 * x^k*(1-x)^(n-k).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =7a(4) =24a(5) =86a(6) =330a(7) =1311a(8) =5326a(9) =22070a(10) =92940a(11) =396466a(12) =1709610a(13) =7440200a(14) =32636590a(15) =144146831a(16) =640500188a(17) =2861175670a(18) =12841853052a(19) =57883546774a(20) =261905659756

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