a(n) = Sum_{k=0..n} binomial(5*n+4,5*k+1).
A387813
a(n) = Sum_{k=0..n} binomial(5*n+4,5*k+1).
Terms
- a(0) =4a(1) =93a(2) =3381a(3) =103702a(4) =3368259a(5) =107232053a(6) =3437550076a(7) =109933682017
External references
- oeis: A387813
A387813
a(n) = Sum_{k=0..n} binomial(5*n+4,5*k+1).