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Search: id:A006059
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| A006059 |
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Number of connected labeled topologies with n points.
(Formerly M1948)
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+0
2
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| 1, 1, 2, 9, 76, 1095, 25386, 910161, 49038872, 3885510411, 445110425110, 72721717736613, 16755380125270788, 5393244363726095487, 2405910197342218830914, 1477264863856923105482745, 1241074736327051013648799024, 1419169006353332682835352361843
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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M. Erne', Struktur- und Anzahlformeln fuer Topologien auf Endlichen Mengen, Manuscripta Math., 11 (1974), 221-259.
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LINKS
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Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 02 2008, Table of n, a(n) for n = 0..19
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FORMULA
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a(n)=n*A001035(n-1) for n>=1 - Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 02 2008
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CROSSREFS
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Sequence in context: A132621 A108992 A058164 this_sequence A006041 A121131 A111196
Adjacent sequences: A006056 A006057 A006058 this_sequence A006060 A006061 A006062
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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More terms from Detlef Pauly (dettodet(AT)yahoo.de), Dec 27, 2001
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