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COMBINATORICS
1998
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COMBINATORICS 1998
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Permutations which are the Union of an Increasing and a Decreasing Subsequence
13 years 11 months ago
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It is shown that there are 2n n − n−1 m=0 2n−m−1 2m m permutations which are the union of an increasing sequence and a decreasing sequence. 1991 Mathematics Subject Classi...
M. D. Atkinson
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