Sum_{k=0..n} k*binomial(n,k)^2*binomial(2*k,k).

A226312

Sum_{k=0..n} k*binomial(n,k)^2*binomial(2*k,k).

Terms

    a(0) =0a(1) =2a(2) =20a(3) =186a(4) =1704a(5) =15510a(6) =140676a(7) =1273230a(8) =11508048a(9) =103919022a(10) =937787100a(11) =8458728630a(12) =76269112200a(13) =687496910490

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