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\(\newcommand{\Cat}{{\rm Cat}} \) \(\newcommand{\A}{\mathcal A} \) \(\newcommand{\freestar}{ \framebox[7pt]{$\star$} }\)

2. $(q,t)$-Catalan Numbers

(Matthias Beck)

      Cite this as: AimPL: Gems of combinatorics, available at http://aimpl.org/gemscombin.