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A007411
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Number of matrices with n columns whose rows do not cover each other. Also antichain covers of an unlabeled n-set.
(Formerly M3558)
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7
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OFFSET
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2,2
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REFERENCES
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V. Jovovic and G. Kilibarda, On enumeration of the class of all monotone Boolean functions, in preparation.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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Micha Hofri (hofri(AT)cs.rice.edu)
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EXTENSIONS
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STATUS
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approved
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