439924466026domain: NAppears in sequencesExpansion of (1-4*x+2*x^2)/(1-7*x+13*x^2-4*x^3).at n=20A078789a(n) = Sum_{k=0..n} binomial(5*n+1,5*k).at n=8A345455a(n) = Sum_{k=0..n} binomial(3*n+2,5*k).at n=13A387038a(n) = Sum_{k=0..n} binomial(2*n+1,5*k).at n=20A387871a(n) = Sum_{k=0..n} binomial(4*n+1,5*k).at n=10A387873