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A005771 Number of n-covers of a 5-set.
(Formerly M4856)
4
1, 12, 103, 736, 4571, 25326, 127415, 588687, 2518997, 10053739, 37656707, 133084998, 445949359, 1422934989, 4340110439, 12697803333, 35744330644, 97081519369, 255032046536, 649459943602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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..20.

Vladeta Jovovic, Binary matrices up to row and column permutations

CROSSREFS

Cf. A005744-A005748, A005783-A005786, A055066.

Sequence in context: A133384 A052067 A050791 * A016228 A016276 A264452

Adjacent sequences:  A005768 A005769 A005770 * A005772 A005773 A005774

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Simon Plouffe

EXTENSIONS

More terms from Vladeta Jovovic, Jun 13 2000

STATUS

approved

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Last modified October 23 06:13 EDT 2018. Contains 316519 sequences. (Running on oeis4.)