620900

Appears in sequences

• Triangle read by rows: T(n,k) is number of labeled bipartite graphs with n nodes and k edges.at n=51A117279
• 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.at n=5A185672