id:A007903 - OEIS Search Results

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Principal ideals in semigroup of binary relations on an n-set.

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2, 4, 11, 60, 877, 42944, 7339704 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`Jin Bai Kim, Bull. Korean Math. Soc., 1983` `George Markowsky, 1991; Markowsky and Breen, 1993; Breen, 1995.`
	LINKS	`Index entries for sequences related to semigroups`
	CROSSREFS	`Sequence in context: A057857 A091233 A156434 this_sequence A006894 A038093 A057284` `Adjacent sequences: A007900 A007901 A007902 this_sequence A007904 A007905 A007906`
	KEYWORD	`nonn,hard,nice`
	AUTHOR	`Michael A Breen [ MAB1699(AT)tntech.edu ]`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.