Moments of Askey-Wilson polynomials
  New formulas for the nth moment of the Askey-Wilson polynomials are given. These are derived using analytic techniques, and by considering three combinatorial models for the moments: Motzkin paths, matchings, and staircase tableaux. A related positivity theorem is given and another one is conjectured. 
Jang Soo Kim and Dennis Stanton
math.CO math.CA