Central factorial numbers: a(n) = 4^n * (n!)^2.

A002454

Central factorial numbers: a(n) = 4^n * (n!)^2.

Terms

    a(0) =1a(1) =4a(2) =64a(3) =2304a(4) =147456a(5) =14745600a(6) =2123366400a(7) =416179814400

External references