A058793 - OEIS

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A058793

Number of covers of an unlabeled n-set such that every point of the set is covered by exactly 6 subsets of the cover and that intersection of every 6 subsets of the cover contains at most one point.

1, 6, 73, 2957, 431805 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Cover may include multiple occurrences of a subset. Also n-rowed binary matrices with distinct rows and all row sums 6.`
	LINKS	`Formula`
	CROSSREFS	`Cf. A050535, A050913, A058783-A058785.` `Sequence in context: A089926 A135594 A168603 * A066171 A057783 A177561` `Adjacent sequences: A058790 A058791 A058792 * A058794 A058795 A058796`
	KEYWORD	`more,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 30 2000`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.