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

A387814

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

Terms

    a(0) =1a(1) =8a(2) =1730a(3) =77540a(4) =5858126a(5) =350739488a(6) =23100202490

External references