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

A070967

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

Terms

    a(0) =1a(1) =2a(2) =926a(3) =37130a(4) =2973350a(5) =174174002a(6) =11582386286a(7) =729520967450

External references