A046906 - OEIS

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A046906

Number of connected irreducible posets with n labeled points.

0, 1, 0, 0, 24, 1080, 52440, 3281880 (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	`S. R. Finch, Series-parallel networks` `Index entries for sequences related to posets`
	CROSSREFS	`A003431 gives isomorphism classes of these posets.` `Sequence in context: A129622 A112011 A112010 * A130552 A160260 A114051` `Adjacent sequences: A046903 A046904 A046905 * A046907 A046908 A046909`
	KEYWORD	`nonn`
	AUTHOR	`John A. Wright.`

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Last modified February 17 03:37 EST 2012. Contains 205978 sequences.