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@article{JIS_2003__6_2_a4, author = {Romik, Dan}, title = {Some formulas for the central trinomial and {Motzkin} numbers}, journal = {Journal of integer sequences}, publisher = {mathdoc}, volume = {6}, number = {2}, year = {2003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/JIS_2003__6_2_a4/} }
Romik, Dan. Some formulas for the central trinomial and Motzkin numbers. Journal of integer sequences, Tome 6 (2003) no. 2. http://geodesic.mathdoc.fr/item/JIS_2003__6_2_a4/