Szu-En Cheng, Sergi Elizalde, Anisse Kasraoui and Bruce Sagan
Inversion polynomials for 321-avoiding permutations
Abstract. We answer some questions raised by Dokos, Dwyer, Johnson, Sagan, and Selsor about inversion
and major index polynomials associated with avoidance of 3-element patterns. We also investigate other
properties of these polynomials, for example deriving continued fractions for their generating functions.
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