@article{SLC_2018_80B_a30,
     author = {Nickolas Hein and Jia Huang},
     title = {Variations of the {Catalan} {Numbers} {From} {Some} {Nonassociative} {Binary} {Operations}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {80B},
     year = {2018},
     url = {http://geodesic.mathdoc.fr/item/SLC_2018_80B_a30/}
}