a(n) = Sum_{k=0..n} binomial(n,k) * binomial(4*n+3*k,k).

A387432

a(n) = Sum_{k=0..n} binomial(n,k) * binomial(4*n+3*k,k).

Terms

    a(0) =1a(1) =8a(2) =114a(3) =1835a(4) =31138a(5) =544338a(6) =9699711a(7) =175165474a(8) =3194598394a(9) =58704371324

External references