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A011988 Covering numbers C(n,7,5) (next term is <= 34). 0
1, 6, 9, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

REFERENCES

CRC Handbook of Combinatorial Designs, 1996, p. 263.

LINKS

Table of n, a(n) for n=7..10.

D. Gordon, La Jolla Repository of Coverings

Index entries for covering numbers

CROSSREFS

Sequence in context: A023041 A118277 A103186 * A161782 A154783 A096546

Adjacent sequences:  A011985 A011986 A011987 * A011989 A011990 A011991

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 14 03:52 EST 2018. Contains 317159 sequences. (Running on oeis4.)