@article{JIS_2015__18_10_a4,
     author = {Arias de Reyna,  Juan and Heyman,  Randell},
     title = {Counting tuples restricted by pairwise coprimality conditions},
     journal = {Journal of integer sequences},
     year = {2015},
     volume = {18},
     number = {10},
     zbl = {1329.11102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2015__18_10_a4/}
}