RightOuterPeaks on Permutation
Peaks of the word p(1) ... p(n) 0: the interior peaks, plus one when p(n) > p(n-1).
Called as CombinatorialStat(x, "RightOuterPeaks"). The head's page has its examples.
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FindStat St000834
The number of right outer peaks of a permutation.
| Object | Value |
|---|---|
[] | 0 |
[1] | 0 |
[1,2] | 1 |
[2,1] | 0 |
[1,2,3] | 1 |
[1,3,2] | 1 |
[2,1,3] | 1 |
[2,3,1] | 1 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000834 has the rest.