a(n) = Sum_{k=0..n} binomial(4*n+3,5*k).

A387906

a(n) = Sum_{k=0..n} binomial(4*n+3,5*k).

Terms

    a(0) =1a(1) =22a(2) =474a(3) =6008a(4) =107883a(5) =1669801a(6) =26789257a(7) =430470899a(8) =6863694378a(9) =109996928003

External references