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A composition of is an ordered collection of one or more positive integers whose sum is . The number of summands is called the number of parts of the composition. A palindromic composition of is a composition of in which the summands are the same in the given or in reverse order. In this paper we study the generating function for the number of compositions (respectively palindromic compositions) of with parts in a given set with respect to the number of rises, levels, and drops. As a consequence, we derive all the previously known results for this kind of problem, as well as many new results.

生成讲解博客的中文版本

生成AI智能校验的中文版本