a(n) = Sum_{k=0..n} binomial(n,k)^2*binomial(n-k,k)^2*(-16)^k.

A179537

a(n) = Sum_{k=0..n} binomial(n,k)^2*binomial(n-k,k)^2*(-16)^k.

Terms

    a(0) =1a(1) =1a(2) =-63a(3) =-575a(4) =6913a(5) =224001a(6) =420801a(7) =-69020223a(8) =-918270975a(9) =14596918273a(10) =511845045697a(11) =336721812417

External references