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A011976 Covering numbers C(n,4,2). 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
CROSSREFS
Sequence in context: A325459 A309947 A138373 * A060022 A187679 A048274
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
a(21)-a(62) from Nathaniel Johnston, Jan 10 2024
STATUS
approved

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Last modified August 29 09:35 EDT 2024. Contains 375511 sequences. (Running on oeis4.)