a(n) = Sum_{k=0..n} binomial(n+k,k)^3.

A112028

a(n) = Sum_{k=0..n} binomial(n+k,k)^3.

Terms

    a(0) =1a(1) =9a(2) =244a(3) =9065a(4) =389376a(5) =18188478a(6) =897376152a(7) =46011772521

External references