a(n) = ((n-1)! * (n+1)!) ^ 2.A179870a(n) = ((n-1)! * (n+1)!) ^ 2.Terms a(0) =4a(1) =36a(2) =2304a(3) =518400a(4) =298598400a(5) =365783040000External referencesoeis: A179870