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

A387848

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

Terms

    a(0) =1a(1) =1a(2) =57a(3) =859a(4) =12393a(5) =215766a(6) =3321891a(7) =53774932a(8) =859595529a(9) =13733091643a(10) =219993856006

External references