a(n) = n! * Laguerre(n, n^2, -n).A295409a(n) = n! * Laguerre(n, n^2, -n).Terms a(0) =1a(1) =3a(2) =58a(3) =2859a(4) =267576a(5) =40818095a(6) =9235507968External referencesoeis: A295409