A011976 - OEIS

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A011976

Covering numbers C(n,4,2).

1, 3, 3, 5, 6, 8, 9, 11, 12, 13, 18, 19, 20, 26, 27, 31, 35, 37, 39, 46, 48, 50, 59, 61, 63, 73, 75, 78, 88, 91, 94, 105, 108, 111, 124, 127, 130, 144, 147, 151, 165, 169, 173, 188, 192, 196, 213, 217, 221, 239, 243, 248, 266, 271, 276, 295, 300, 305, 326

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

OFFSET

4,2

COMMENTS

Only differs from A240115 when n = 7, 9, 10, or 19. - Nathaniel Johnston, Jan 10 2024

REFERENCES

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

LINKS

Table of n, a(n) for n=4..62.

D. Gordon, La Jolla Repository of Coverings

Index entries for covering numbers

CROSSREFS