id:A046904 - OEIS Search Results

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Number of isomorphism classes of posets with n points with property that there is no nonsingelton proper subset T for which x not in T implies x<T or x>T or x incomparable with every element of T.

+0
2

1, 1, 0, 0, 1, 4, 28, 234 (list; graph; listen)

	OFFSET	`0,6`
	REFERENCES	`J. A. Wright, There are 718 6-point topologies, quasi-orderings and transgraphs, Notices Amer. Math. Soc., 17 (1970), p. 646, Abstract #70T-A106.`
	LINKS	`Index entries for sequences related to posets`
	CROSSREFS	`A subset of the posets enumerated in A003431. Cf. A046905.` `Sequence in context: A152599 A089023 A035610 this_sequence A030444 A093877 A151830` `Adjacent sequences: A046901 A046902 A046903 this_sequence A046905 A046906 A046907`
	KEYWORD	`nonn`
	AUTHOR	`John A. Wright.`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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