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NumberOfPermutationsByInversions
gives the number of permutations of length 
with exactly 
inversions.
NumberOfPermutationsByInversions[n]
gives a table of the number of length-
permutations with 
inversions, for all 
.
更多信息
- To use
, you first need to load the Combinatorica Package using Needs["Combinatorica`"].
