Using the Entringer numbers to count the alternating permutations according a new parameter
Résumé
The Entringer's integers were counting the down-up (or up-down) permutations according to the first or the last term ; In this paper they are shown to enumerate the same permutations according to the absolute difference between the first and the last terms.
Domaines
Mathématiques [math]
Origine : Accord explicite pour ce dépôt