a(n) = n^2 * 2^n * binomial(4*n, n).

A378805

a(n) = n^2 * 2^n * binomial(4*n, n).

Terms

    a(0) =0a(1) =8a(2) =448a(3) =15840a(4) =465920a(5) =12403200a(6) =310109184a(7) =7426298880a(8) =172331827200

External references