id:A095153 - OEIS Search Results

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Number of 4-block covers of a labeled n-set.

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35, 1225, 24990, 426650, 6779185, 104394675, 1585021340, 23909487700, 359582866335, 5400330984125, 81051093085690, 1216089331752750, 18243600636165485, 273669834496409575, 4105158293128058040 (list; graph; listen)

	OFFSET	`3,1`
	FORMULA	`(1/4!)(-50+353^n-10*7^n+15^n).`
	CROSSREFS	`Column of A055154.` `Sequence in context: A046176 A029546 A126158 this_sequence A009979 A158733 A029560` `Adjacent sequences: A095150 A095151 A095152 this_sequence A095154 A095155 A095156`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), May 31 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research