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A005771
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Number of n-covers of a 5-set.
(Formerly M4856)
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4
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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; 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: A133384 A052067 A050791 * A016228 A016276 A078397
Adjacent sequences: A005768 A005769 A005770 * A005772 A005773 A005774
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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
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 13 2000
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