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A326898
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Number of unlabeled topologies with up to n points.
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5
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1, 2, 5, 14, 47, 186, 904, 5439, 41418, 404501, 5122188, 84623842, 1828876351, 51701216248, 1908493827243, 91755916071736, 5729050033597431
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OFFSET
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0,2
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LINKS
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EXAMPLE
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Non-isomorphic representatives of the a(0) = 1 through a(3) = 14 topologies:
{} {} {} {}
{}{1} {}{1} {}{1}
{}{12} {}{12}
{}{2}{12} {}{123}
{}{1}{2}{12} {}{2}{12}
{}{3}{123}
{}{23}{123}
{}{1}{2}{12}
{}{1}{23}{123}
{}{3}{23}{123}
{}{2}{3}{23}{123}
{}{3}{13}{23}{123}
{}{2}{3}{13}{23}{123}
{}{1}{2}{3}{12}{13}{23}{123}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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