WeakExcedanceMidPointsOfOccurrencesOf321 on Permutation
Positions i with p(i) >= i that are the middle of a 321 occurrence.
Called as CombinatorialStat(x, "WeakExcedanceMidPointsOfOccurrencesOf321"). The head's page has its examples.
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FindStat St000373
The number of weak exceedences of a permutation that are also mid-points of a decreasing subsequence of length .
| Object | Value |
|---|---|
[] | 0 |
[1] | 0 |
[1,2] | 0 |
[2,1] | 0 |
[1,2,3] | 0 |
[1,3,2] | 0 |
[2,1,3] | 0 |
[2,3,1] | 0 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000373 has the rest.