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A005748 Number of n-covers of a 7-set.
(Formerly M5098)
+0
18
1, 20, 348, 6093, 108182, 1890123, 31500927, 490890277, 7086257602, 94548676765, 1167995082810, 13406707973018, 143598707530374, 1441525802509250, 13619352767824724, 121574625625030584 (list; graph; listen)
OFFSET

1,2

REFERENCES

R. J. Clarke, Covering a set by subsets, Discrete Math., 81 (1990), 147-152.

LINKS

Vladeta Jovovic, Binary matrices up to row and column permutations

CROSSREFS

Cf. A005744-A005747, A005783-A005786, A055066.

Adjacent sequences: A005745 A005746 A005747 this_sequence A005749 A005750 A005751

Sequence in context: A101310 A078230 A084032 this_sequence A093144 A089350 A004292

KEYWORD

nonn

AUTHOR

njas, Simon Plouffe (plouffe(AT)math.uqam.ca)

EXTENSIONS

Corrected and extended by Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 13 2000

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.


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