a(n) = Sum_{k=0..n} binomial(5*n+1,k) * binomial(3*n-k,n-k).

A386896

a(n) = Sum_{k=0..n} binomial(5*n+1,k) * binomial(3*n-k,n-k).

Terms

    a(0) =1a(1) =9a(2) =125a(3) =1932a(4) =31365a(5) =523809a(6) =8910356a(7) =153544680a(8) =2671398309a(9) =46822319115a(10) =825501663525

External references