a(n) = Sum_{k=0..n} binomial(6*n+4,6*k).

A387878

a(n) = Sum_{k=0..n} binomial(6*n+4,6*k).

Terms

    a(0) =1a(1) =211a(2) =9829a(3) =728575a(4) =43942081a(5) =2884834891a(6) =182670807229

External references