@article{JIS_2005__8_5_a6,
     author = {Woan,  Wen-jin},
     title = {Animals and {2-Motzkin} paths},
     journal = {Journal of integer sequences},
     year = {2005},
     volume = {8},
     number = {5},
     zbl = {1103.05008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2005__8_5_a6/}
}