a(n) = [x^n] hypergeom([1/2, 1/2], [1], 256*x).

A387488

a(n) = [x^n] hypergeom([1/2, 1/2], [1], 256*x).

Terms

    a(0) =1a(1) =64a(2) =9216a(3) =1638400a(4) =321126400a(5) =66588770304

External references