a(n) = Sum_{k=0..n} binomial(n,k) * binomial(6*k,k) / (5*k + 1).

A346648

a(n) = Sum_{k=0..n} binomial(n,k) * binomial(6*k,k) / (5*k + 1).

Terms

    a(0) =1a(1) =2a(2) =9a(3) =73a(4) =751a(5) =8587a(6) =104425a(7) =1323952a(8) =17303503a(9) =231455104a(10) =3153167249a(11) =43597546197a(12) =610232050453

External references