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MR1168135 (93c:05011) 05A15 (05A05) Zeilberger, Doron A proof of Julian West's conjecture that the number of two-stack-sortable permutations of length $n$ is $2(3n)!/((n+1)!(2n+1)!)$. Discrete Math. 102 (1992), no. 1, 85--93.

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