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A005748
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Number of n-covers of a 7-set.
(Formerly M5098)
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18
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1, 20, 348, 6093, 108182, 1890123, 31500927, 490890277, 7086257602, 94548676765, 1167995082810, 13406707973018, 143598707530374, 1441525802509250, 13619352767824724, 121574625625030584
(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-A005747, A005783-A005786, A055066.
Sequence in context: A084032 A166984 A167031 * A093144 A156455 A089350
Adjacent sequences: A005745 A005746 A005747 * A005749 A005750 A005751
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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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