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URL: https://oeis.org/A011980

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A011980

Covering numbers C(n,5,3).

0

1, 4, 5, 8, 12, 17, 20

(list; graph; refs; listen; history; text; internal format)

OFFSET

5,2

COMMENTS

a(12) <= 29.

REFERENCES

CRC Handbook of Combinatorial Designs, 1996, p. 262.

LINKS

Table of n, a(n) for n=5..11.

D. Gordon, La Jolla Repository of Coverings.

Wikipedia, Covering design.

Index entries for covering numbers.

CROSSREFS

Sequence in context: A188077 A370428 A027975 * A260163 A362560 A061765

Adjacent sequences: A011977 A011978 A011979 * A011981 A011982 A011983

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane

STATUS

approved