Let f(n) = Sum_{j>=1} j^n*3^j/binomial(2*j,j) = r_n*Pi/sqrt(3) + s_n; sequence gives r_n.

A185672

Let f(n) = Sum_{j>=1} j^n*3^j/binomial(2*j,j) = r_n*Pi/sqrt(3) + s_n; sequence gives r_n.

Terms

    a(0) =4a(1) =20a(2) =172a(3) =2084a(4) =32524a(5) =620900a(6) =14014732a(7) =365100644a(8) =10781360524a(9) =355869575780

External references