id:A122836 - OEIS Search Results

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Number of topologies on n labeled elements in which at least one element belongs to some pair of noncomparable members of the topology.

+0
2

0, 0, 0, 10, 243, 6131, 202503, 9464302, 641960602, 63249658532, 8976900501699, 1816843604787333, 519355528928422629, 20788139292866381430470, 115617051961092253351796, 88736269118240819706018342 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`See comments in A122835.`
	REFERENCES	`J. Munkres, Topology, Prentice Hall, (2000), p. 76.`
	CROSSREFS	`a(n) = A000798(n) - A122835(n).` `Adjacent sequences: A122833 A122834 A122835 this_sequence A122837 A122838 A122839` `Sequence in context: A067423 A064757 A087435 this_sequence A116878 A034222 A108792`
	KEYWORD	`hard,nice,nonn`
	AUTHOR	`Nathan K. McGregor (mcgregnk(AT)ese.wustl.edu), Sep 15 2006`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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