A $q,t$-analogue of Narayana numbers. Aval, J., D'Adderio, M., Dukes, M., Hicks, A., & Le Borgne, Y. In 25th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2013), of Discrete Math. Theor. Comput. Sci. Proc., AS, pages 623–634. Assoc. Discrete Math. Theor. Comput. Sci., Nancy, 2013.
bibtex   
@incollection {MR3091027,
	AUTHOR = {Aval, Jean-Christophe and D'Adderio, Michele and Dukes, Mark
	and Hicks, Angela and Le Borgne, Yvan},
	TITLE = {A {$q,t$}-analogue of {N}arayana numbers},
	BOOKTITLE = {25th {I}nternational {C}onference on {F}ormal {P}ower {S}eries
	and {A}lgebraic {C}ombinatorics ({FPSAC} 2013)},
	SERIES = {Discrete Math. Theor. Comput. Sci. Proc., AS},
	PAGES = {623--634},
	PUBLISHER = {Assoc. Discrete Math. Theor. Comput. Sci., Nancy},
	YEAR = {2013},
	MRCLASS = {05B50 (05Axx 05E05)},
	MRNUMBER = {3091027},
}

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