Geodesic
Delannoy and tetrahedral numbers
Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 3, pp. 389-394.

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We establish an identity between Delannoy numbers and tetrahedral numbers of arbitrary dimension.
Classification : 05A10, 05A15, 05A19
Keywords: Delannoy numbers; tetrahedral numbers; king's walk; coordination number; crystal ball 
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     title = {Delannoy and tetrahedral numbers},
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Schröder, Joachim. Delannoy and tetrahedral numbers. Commentationes Mathematicae Universitatis Carolinae, Tome 48 (2007) no. 3, pp. 389-394. http://geodesic.mathdoc.fr/item/CMUC_2007__48_3_a1/