a(n) = n! * Laguerre(n, 4*n, -n).

A295408

a(n) = n! * Laguerre(n, 4*n, -n).

Terms

    a(0) =1a(1) =6a(2) =134a(3) =5052a(4) =267576a(5) =18246850a(6) =1521907056a(7) =150077897088

External references