a(n) = Sum_{k=0..n} binomial(7*n,7*k).

A094211

a(n) = Sum_{k=0..n} binomial(7*n,7*k).

Terms

    a(0) =1a(1) =2a(2) =3434a(3) =232562a(4) =42484682a(5) =4653367842a(6) =644032289258

External references