A046905 - OEIS

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A046905

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.

1, 1, 0, 0, 24, 360, 17400, 1066800 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	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. A046904.` `Sequence in context: A081144 A126780 A052741 * A028115 A125481 A028074` `Adjacent sequences: A046902 A046903 A046904 * A046906 A046907 A046908`
	KEYWORD	`nonn`
	AUTHOR	`John A. Wright.`

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Last modified February 15 17:40 EST 2012. Contains 205828 sequences.