Index
Index[p]
gives the index of permutation 
, the sum of all subscripts 
such that 
is greater than 
.
Combinatorica`
Combinatorica`
Index
Index[p]
gives the index of permutation 
, the sum of all subscripts 
such that 
is greater than 
.
Details and Options
- To use Index, you first need to load the Combinatorica Package using Needs["Combinatorica`"].