Higher order recurrence relation for exceptional Charlier, Meixner,   Hermite and Laguerre orthogonal polynomials
  In this paper we prove in a constructing way that exceptional Charlier, Meixner, Hermite and Laguerre polynomials satisfy higher order recurrence relations. Our conjecture is that the recurrence relations provided in this paper have minimal order. 
Antonio J. Dur\'an
math.CA