@article{JIS_2004__7_3_a3,
     author = {Lamathe,  C\'edric},
     title = {The number of labelled \(k\)-arch graphs},
     journal = {Journal of integer sequences},
     year = {2004},
     volume = {7},
     number = {3},
     zbl = {1065.05052},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2004__7_3_a3/}
}