A004035 The coding-theoretic function A(n,4,5).

0, 1, 1, 3, 8, 18, 36, 66, 80

Offset: 4

Author

N. J. A. Sloane

Keywords

• nonn
• hard
• more

Comments

The first open case is A(13,4,5) >= 123.

References

• CRC Handbook of Combinatorial Designs, 1996, p. 411.
• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• A. E. Brouwer, Bounds for binary constant weight codes
• A. E. Brouwer, J. B. Shearer, N. J. A. Sloane and W. D. Smith, New table of constant weight codes, IEEE Trans. Info. Theory 36 (1990), 1334-1380.
• Index entries for sequences related to A(n,d,w)

Extensions

a(4) corrected by Pontus von Brömssen, Dec 12 2018