The paper introduces pattern avoidance for compositions and enumerates permutations avoiding the chains (312,321:σ) for arbitrary σ and (312,4321:σ) for σ in S3.
Knuth,The Art of Computer Programming, Vol
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Pattern avoidance in compositions and powers of permutations
The paper introduces pattern avoidance for compositions and enumerates permutations avoiding the chains (312,321:σ) for arbitrary σ and (312,4321:σ) for σ in S3.