A probabilistic interpretation of a sequence related to Narayana   polynomials
  A sequence of coefficients appearing in a recurrence for the Narayana polynomials is generalized. The coefficients are given a probabilistic interpretation in terms of beta distributed random variables. The recurrence established by M. Lasalle is then obtained from a classical convolution identity. Some arithmetical properties of the generalized coefficients are also established. 
T. Amdeberhan, V. H. Moll and C. Vignat
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