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OccurrencesOf1Over23Openers2Closers1Arc23 on SetPartition ​

Occurrences of the pattern 1/23 with 2 the least element of its block, 1 the greatest element of its block and 2 and 3 consecutive in one block.

On SetPartition

Called as CombinatorialStat(x, "OccurrencesOf1Over23Openers2Closers1Arc23"). The head's page has its examples.

Live

Distribution

Over SetPartitions at each size, tallied here in your browser; sizes past 10 are not offered.

FindStat St000590

The number of occurrences of the pattern {{1},{2,3}} such that 2 is minimal, 1 is maximal, (2,3) are consecutive in a block.

ObjectValue
{{1,2}}0
{{1,2,3}}0
{{1},{2}}0
{{1,2,3,4}}0
{{1,2},{3}}0
{{1,3},{2}}0
{{1},{2,3}}1
{{1,2,3,4,5}}0

Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000590 has the rest.