a(n) = n! * Laguerre(n, 2*n, -n).

A295406

a(n) = n! * Laguerre(n, 2*n, -n).

Terms

    a(0) =1a(1) =4a(2) =58a(3) =1422a(4) =49000a(5) =2174360a(6) =118023264a(7) =7574532826a(8) =561071549056

External references