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Search: id:A047684
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| A047684 |
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Number of reduced contexts on n unlabeled objects. |
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+0
1
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OFFSET
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1,2
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COMMENT
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Equivalently, number of closure systems on n points, up to isomorphism.
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REFERENCES
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Bernhard Ganter, Rudolf Wille: Formal Concept Analysis, Springer-Verlag, 1999, ISBN 3-540-62771-5, p. 59.
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CROSSREFS
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Sequence in context: A067966 A165327 A090242 this_sequence A162955 A064448 A110817
Adjacent sequences: A047681 A047682 A047683 this_sequence A047685 A047686 A047687
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KEYWORD
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hard,nonn,nice
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AUTHOR
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Bernhard Ganter (ganter(AT)math.tu-dresden.de)
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