id:A058793 - OEIS Search Results

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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.

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1, 6, 73, 2957, 431805 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`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: A041060 A089926 A135594 this_sequence A066171 A057783 A069852` `Adjacent sequences: A058790 A058791 A058792 this_sequence A058794 A058795 A058796`
	KEYWORD	`more,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 30 2000`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research