a(n) = (-1)^n*A387347(n,n).A392805a(n) = (-1)^n*A387347(n,n).Terms a(0) =1a(1) =1a(2) =1a(3) =4a(4) =9a(5) =5184a(6) =50a(7) =25920000a(8) =5023265625a(10) =395210285568External referencesoeis: A392805