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A223034
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Number of 3-vexillary permutations in S_n, that is, permutations whose Stanley symmetric function has at most 3 terms or at most 3 Edelman-Greene tableaux.
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1
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1, 1, 2, 6, 24, 120, 705, 4553, 30930, 216412, 1545469
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OFFSET
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0,3
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COMMENTS
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This family is characterized by a finite set of permutation patterns.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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