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

A345458

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

Terms

    a(0) =1a(1) =127a(2) =3004a(3) =107883a(4) =3321891a(5) =107746282a(6) =3431847189a(7) =109996928003

External references