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FirstRowHookLengthSum on IntegerPartition ​

The sum of the hook lengths in the first row: the size plus the binomial of the largest part and 2.

On IntegerPartition

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

Live

FindStat St000867

The sum of the hook lengths in the first row of an integer partition.

ObjectValue
[]0
[1]1
[2]3
[3]6
[4]10
[5]15
[6]21
[7]28

Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000867 has the rest.