A095152 - OEIS

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A095152

Number of 3-block covers of a labeled n-set.

1, 32, 321, 2560, 18881, 135072, 954241, 6705920, 47020161, 329377312, 2306349761, 16146574080, 113032395841, 791245902752, 5538778714881, 38771623191040, 271401878897921, 1899814701967392, 13298707562817601 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	FORMULA	`(1/3!)(11-63^n+7^n).`
	CROSSREFS	`Column of A055154.` `Sequence in context: A165004 A173952 A165008 * A087342 A083468 A125395` `Adjacent sequences: A095149 A095150 A095151 * A095153 A095154 A095155`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), May 31 2004`

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Last modified February 16 09:27 EST 2012. Contains 205904 sequences.