There is hope for a recurrence of order, 1

         (x + 1) (x + 1 + z)
- --------------------------------- + X, [t1 (-x t2 - 2 t2 z - t2 y - 2 t2 - x
  (x + 2 z + y + 2) (x + z + y + 2)

     - 1 + x t1 t2 + 2 t1 t2 z + y t1 t2 + 2 t1 t2 + x t1 + t1)/(2

    (x + 2 z + y + 2) (x + z + y + 2)), t2 (-x t1 - 2 z t1 - y t1 - 2 t1 + x t2

     + t2 - x - 1 + x t1 t2 + 2 t1 t2 z + y t1 t2 + 2 t1 t2)/(2

    (x + 2 z + y + 2) (x + z + y + 2))]

                                     0.238