@article{JIS_2003__6_1_a1,
     author = {Sulanke,  Robert A.},
     title = {Objects counted by the central {Delannoy} numbers},
     journal = {Journal of integer sequences},
     year = {2003},
     volume = {6},
     number = {1},
     zbl = {1012.05008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2003__6_1_a1/}
}