@article{JIS_2017__20_5_a4,
     author = {Haymaker, Kathryn and Robertson, Sara},
     title = {Counting colorful tilings of rectangular arrays},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2017__20_5_a4/}
}