Narayana polynomials and Hall-Littlewood symmetric functions
  We show that Narayana polynomials are a specialization of row Hall-Littlewood symmetric functions. Using lambda-ring calculus, we generalize to Narayana polynomials the formulas of Koshy and Jonah for Catalan numbers. 
Michel Lassalle (CNRS, Marne la Vallee, France)
math.CO