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Search: id:A018195
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| A018195 |
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Possible numbers of complements of topologies on 4 points. |
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+0
1
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OFFSET
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0,2
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REFERENCES
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J. I. Brown and S. Watson, The number of complements of a topology on n points is at least 2^n (except for some special cases), Discr. Math., 154 (1996), 27-39.
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CROSSREFS
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Sequence in context: A164831 A085188 A083561 this_sequence A086417 A051215 A034885
Adjacent sequences: A018192 A018193 A018194 this_sequence A018196 A018197 A018198
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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