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"A proof of Julian West's conjecture that the number of two-stacksortable ..."
Doron Zeilberger (1992)
- Doron Zeilberger:
A proof of Julian West's conjecture that the number of two-stacksortable permutations of length n is 2(3n)!/((n + 1)!(2n + 1)!). Discret. Math. 102(1): 85-93 (1992)
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