a(n) = Sum_{k=0..n} binomial(5*n+2,5*k).

A345456

a(n) = Sum_{k=0..n} binomial(5*n+2,5*k).

Terms

    a(0) =1a(1) =22a(2) =859a(3) =25773a(4) =843756a(5) =26789257a(6) =859595529a(7) =27481113638a(8) =879683351911

External references