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A137814
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Smallest size (greater than 1) of a topology that cannot be made using n points.
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1
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OFFSET
| 1,1
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REFERENCES
| K. Ragnarsson and B. E. Tenner, Obtainable sizes of topologies on finite sets, J. Combin. Theory Ser. A 117 (2010) 138-151.
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EXAMPLE
| There is no topology on 3 points having 7 open sets. However, there do exist topologies on 3 points that have 2, 3, 4, 5 and 6 open sets.
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CROSSREFS
| Cf. A137813.
Sequence in context: A071997 A093442 A155008 * A175196 A077858 A126116
Adjacent sequences: A137811 A137812 A137813 * A137815 A137816 A137817
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KEYWORD
| nonn
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AUTHOR
| Bridget Eileen Tenner (bridget(AT)math.depaul.edu), Feb 11 2008
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