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All permutations of a sequence


I would like to get all unique permutations of a sequence (e.g. 
{1,2,3,4,5,6,7,8,9,10,11,12,13}) with the constraint that all sequences 
that have an opposite ordering are not included (e.g. {13, 12, 
11,10,9,8,6,5,4,3,2,1}) would not be included.

Are there some Mathematica commands that can be used to efficiently 
generate these permutations?

--V. Stokes


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