OccurrencesOf321 on Permutation
Triples i < j < k with p(i) > p(j) > p(k).
Called as CombinatorialStat(x, "OccurrencesOf321"). The head's page has its examples.
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FindStat St000119
The number of occurrences of the pattern 321 in a permutation.
| Object | Value |
|---|---|
[1] | 0 |
[1,2] | 0 |
[2,1] | 0 |
[1,2,3] | 0 |
[1,3,2] | 0 |
[2,1,3] | 0 |
[2,3,1] | 0 |
[3,1,2] | 0 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000119 has the rest.