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

A367271

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

Terms

    a(0) =1a(1) =2a(2) =24a(3) =540a(4) =17920a(5) =787500a(6) =43110144a(7) =2826399576a(8) =215922769920

External references