Permutations which are the union of an increasing and a decreasing subsequence (Q1379128)
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scientific article; zbMATH DE number 1119071
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Permutations which are the union of an increasing and a decreasing subsequence |
scientific article; zbMATH DE number 1119071 |
Statements
Permutations which are the union of an increasing and a decreasing subsequence (English)
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18 February 1998
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Summary: It is shown that there are \({2n\choose n}-\sum_{m=0}^{n-1}2^{n-m-1}{2m\choose m}\) permutations which are the union of an increasing sequence and a decreasing sequence.
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permutations
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sequences
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