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

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

Cf. A011975, A011977.

Sequence in context: A325459 A309947 A138373 * A060022 A187679 A048274

Adjacent sequences: A011973 A011974 A011975 * A011977 A011978 A011979

Keyword

nonn,easy

Author

N. J. A. Sloane.

Extensions

a(21)-a(62) from Nathaniel Johnston, Jan 10 2024

Status

approved