A007776 - OEIS

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A007776

Number of connected posets with n elements of height 1.

1, 2, 4, 10, 27, 88, 328, 1460, 7799, 51196, 422521, 4483460, 62330116, 1150504224, 28434624153, 945480850638, 42417674401330, 2572198227615998, 211135833162079184, 23487811567341121158, 3545543330739039981738 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`EULERi transform of A048194 and A049312. - Detlef Pauly (dettodet(AT)yahoo.de) and Vladeta Jovovic (vladeta(AT)eunet.rs). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 25 2003`
	LINKS	`N. J. A. Sloane, Transforms` `Index entries for sequences related to posets`
	CROSSREFS	`Cf. A005142, A002031 (labeled case).` `Sequence in context: A148107 A148108 A057786 * A123428 A005975 A048193` `Adjacent sequences: A007773 A007774 A007775 * A007777 A007778 A007779`
	KEYWORD	`nonn`
	AUTHOR	`gw(AT)informatik.Uni-Koeln.DE (Georg Wambach)`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 25 2003`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.