

A058792


Number of covers of an unlabeled nset such that every point of the set is covered by exactly 5 subsets of the cover and that intersection of every 5 subsets of the cover contains at most one point.


1




OFFSET

1,2


COMMENTS

Cover may include multiple occurrences of a subset. Also nrowed binary matrices with distinct rows and all row sums 5.


LINKS

Table of n, a(n) for n=1..10.
Vladeta Jovovic, Formula


CROSSREFS

Row n=5 of A331508.
Cf. A050535, A050913, A058783, A058784, A058785.
Sequence in context: A301655 A048940 A218375 * A113948 A215517 A215584
Adjacent sequences: A058789 A058790 A058791 * A058793 A058794 A058795


KEYWORD

more,nonn


AUTHOR

Vladeta Jovovic, Nov 30 2000


EXTENSIONS

a(7)a(10) from Andrew Howroyd, Jan 29 2020


STATUS

approved



