Lattice paths with a first return decomposition constrained by the maximal height of a pattern

  title={Lattice paths with a first return decomposition constrained by the maximal height of a pattern},
  author={Jean-Luc Baril and Sergey Kirgizov},
We consider the system of equations Ak(x) = p(x)Ak−1(x)(q(x) + ∑ k i=0 Ai(x)) for k > r+ 1 where Ai(x), 0 6 i 6 r, are some given functions and show how to obtain a close form for A(x) = ∑ k>0 Ak(x). We apply this general result to the enumeration of certain subsets of Dyck, Motzkin, skew Dyck, and skew Motzkin paths, defined recursively according to the first return decomposition with a monotonically non-increasing condition relative to the maximal ordinate reached by an occurrence of a given… Expand


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