  The most amazing (at least to me) result in Enumerative Combinatorics is
Dominique Gouyou-Beauchamps and Xavier Viennot's theorem that states that the
number of so-called directed animals with compact source (that are equivalent,
via Viennot's beautiful concept of heaps, to towers of dominoes, that I take
the liberty of renaming xaviers) with n+1 points equals 3^n. This amazing
result received an even more amazing proof by Jean B\'etrema and Jean-Guy
Penaud. Both theorem and proof deserve to be better known! Hence this article,
that is also accompanied by a comprehensive Maple package
http://www.math.rutgers.edu/~zeilberg/tokhniot/BORDELAISE that implements
everything (and much more)
