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Power Series for Up-Down Min-Max Permutations

Fiacha Heneghan and Kyle Petersen
The College Mathematics Journal
Vol. 45, No. 2 (March 2014), pp. 83-91
DOI: 10.4169/college.math.j.45.2.083
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Page Count: 9
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Power Series for Up-Down Min-Max Permutations
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Summary Calculus and combinatorics overlap, in that power series can be used to study combinatorially defined sequences. In this paper, we use exponential generating functions to study a curious refinement of the Euler numbers, which count the number of “up-down” permutations of length n.

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