ConjugateAfterCycleType from Permutation
The conjugate partition of the cycle type.
Entry j is the count of cycles of length at least j — non-increasing in j by construction, so it comes out sorted without needing one.
Called as CombinatorialMap(x, "ConjugateAfterCycleType"). The head's page has its examples.
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Transport a statistic
Pick a statistic on IntegerPartition. Its distribution over the images of Permutation at each size is computed, and compared with the 323 statistics on Permutation: those that share it are the ones the map sends it to, as far as the sizes computed show.