PairwiseProductSum on IntegerPartition

The sum of the products of all pairs of parts.

On IntegerPartition

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

Live

FindStat St000567

The sum of the products of all pairs of parts.

Object	Value
`[2]`	`0`
`[3]`	`0`
`[4]`	`0`
`[5]`	`0`
`[6]`	`0`
`[7]`	`0`
`[8]`	`0`
`[9]`	`0`

Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000567 has the rest.