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A011976 Covering numbers C(n,4,2). 0
1, 3, 3, 5, 6, 8, 9, 11, 12, 13, 18, 19, 20, 26, 27, 31, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

REFERENCES

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

LINKS

Table of n, a(n) for n=4..20.

D. Gordon, La Jolla Repository of Coverings

Index entries for covering numbers

CROSSREFS

Sequence in context: A325459 A309947 A138373 * A060022 A187679 A048274

Adjacent sequences:  A011973 A011974 A011975 * A011977 A011978 A011979

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 26 14:45 EDT 2021. Contains 346294 sequences. (Running on oeis4.)