Statistics on parallelogram polyominoes and a $q,t$-analogue of the Narayana numbers. Aval, J., D'Adderio, M., Dukes, M., Hicks, A., & Le Borgne, Y. J. Combin. Theory Ser. A, 123:271–286, 2014.
Statistics on parallelogram polyominoes and a $q,t$-analogue of the Narayana numbers [link]Paper  bibtex   
@article {MR3157811,
	AUTHOR = {Aval, Jean-Christophe and D'Adderio, Michele and Dukes, Mark
		and Hicks, Angela and Le Borgne, Yvan},
	TITLE = {Statistics on parallelogram polyominoes and a {$q,t$}-analogue
		of the {N}arayana numbers},
	JOURNAL = {J. Combin. Theory Ser. A},
	FJOURNAL = {Journal of Combinatorial Theory. Series A},
	VOLUME = {123},
	YEAR = {2014},
	PAGES = {271--286},
	ISSN = {0097-3165},
	MRCLASS = {05B50 (05E05)},
	MRNUMBER = {3157811},
	MRREVIEWER = {Anton Vladimirovich Shutov},
	URL = {https://doi.org/10.1016/j.jcta.2013.09.001},
}

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