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A005786 Number of 6-covers of an n-set.
(Formerly M4244)
8
6, 43, 336, 2864, 25326, 223034, 1890123, 15115098, 112980937, 787320629, 5121184083, 31188412225, 178517111561, 964196387369, 4933278065881, 23997707450765, 111358094980387, 494444748602595, 2106504840061571 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

R. J. Clarke, Covering a set by subsets, Discrete Math., 81 (1990), 147-152.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..19.

Vladeta Jovovic, Binary matrices up to row and column permutations

CROSSREFS

Cf. A005785.

Sequence in context: A025594 A098665 A153397 * A071541 A146966 A240653

Adjacent sequences:  A005783 A005784 A005785 * A005787 A005788 A005789

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Jun 12 2000

STATUS

approved

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Last modified November 29 01:24 EST 2014. Contains 250479 sequences.