@article{JIS_2016__19_7_a2,
     author = {Janji\'c,  Milan},
     title = {Binomial coefficients and enumeration of restricted words},
     journal = {Journal of integer sequences},
     year = {2016},
     volume = {19},
     number = {7},
     zbl = {1348.05016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2016__19_7_a2/}
}