a(n) = n! * Laguerre(n, n*(n-1), -n).A295418a(n) = n! * Laguerre(n, n*(n-1), -n).Terms a(0) =1a(1) =2a(2) =32a(3) =1422a(4) =124832a(5) =18246850a(6) =4005713952External referencesoeis: A295418