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A005747 Number of n-covers of a 6-set.
(Formerly M5018)
4
1, 16, 196, 2197, 22952, 223034, 2004975, 16642937, 127654604, 907349654, 6000728764, 37093282121, 215296646264, 1178514299094, 6108871834312, 30098215339608, 141433252447082, 635816643771438, 2742163498527536 (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..19.

Vladeta Jovovic, Binary matrices up to row and column permutations

CROSSREFS

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

Sequence in context: A126981 A086940 A016173 * A103721 A144844 A093060

Adjacent sequences:  A005744 A005745 A005746 * A005748 A005749 A005750

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Simon Plouffe

EXTENSIONS

Corrected and extended by Vladeta Jovovic, Jun 13 2000

STATUS

approved

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Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)