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A005747
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Number of n-covers of a 6-set.
(Formerly M5018)
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4
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1, 16, 196, 2197, 22952, 223034, 2004975, 16642937, 127654604, 907349654, 6000728764, 37093282121, 215296646264, 1178514299094, 6108871834312, 30098215339608, 141433252447082, 635816643771438, 2742163498527536
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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).
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LINKS
| Vladeta Jovovic, Binary matrices up to row and column permutations
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CROSSREFS
| Cf. A005744-A005748, A005783-A005786, A055066.
Sequence in context: A126981 A086940 A016173 * A103721 A144844 A093060
Adjacent sequences: A005744 A005745 A005746 * A005748 A005749 A005750
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| Corrected and extended by Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 13 2000
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