Trees, permutations and the tangent function

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This is a report on a talk to high school mathematics students. It gives some combinatorial connections for the entries of the boustrophedon triangle whose sides are the Taylor coefficients for the tangent and secant functions.
9 pages, pdf file of MacWrite document

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History and Overview, Combinatorics, 41A58

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http://salesiana.dossiersoluciones.com/handle/123456789/66855

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0303267
 http://arxiv.org/abs/math/0303267
 Reflections 27 (2) (Math. Assoc. of New South Wales, May 2002) 19-23

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arXiv