The 2n-1 factor for multi-dimensional lattice paths with diagonal steps.
Duchi, E. ; Sulanke, R.A.
Séminaire Lotharingien de Combinatoire [electronic only], Tome 52 (2004), / Harvested from The Electronic Library of Mathematics
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Publié le : 2004-01-01
EUDML-ID : urn:eudml:doc:124750 
@article{02171953,
     title = {The },
     journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
     volume = {52},
     year = {2004},
     zbl = {1065.05007},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02171953}
}

Duchi, E.; Sulanke, R.A. The . Séminaire Lotharingien de Combinatoire [electronic only], Tome 52 (2004) . http://gdmltest.u-ga.fr/item/02171953/