109996928003domain: NAppears in sequencesExpansion of (1-4*x+2*x^2)/(1-7*x+13*x^2-4*x^3).at n=19A078789a(n) = Sum_{k=0..n} binomial(5*n+4,5*k).at n=7A345458a(n) = Sum_{k=0..n} binomial(3*n,5*k).at n=13A387847a(n) = Sum_{k=0..n} binomial(2*n+1,5*k).at n=19A387871a(n) = Sum_{k=0..n} binomial(4*n+3,5*k).at n=9A387906