A030504 Graham-Sloane-type lower bound on the size of a ternary (n,3,4) constant-weight code.

2, 8, 19, 38, 66, 107, 160, 230, 317, 424, 553, 705, 883, 1088, 1324, 1591, 1891, 2227, 2601, 3015, 3470, 3969, 4514, 5106, 5748, 6441, 7189, 7992, 8852, 9772, 10754, 11800, 12911, 14090, 15339, 16659, 18053, 19522, 21070, 22697

Offset

4,1

Links

Table of n, a(n) for n=4..43.

M. Svanstrom, A lower bound for ternary constant weight codes, IEEE Trans. on Information Theory, Vol. 43, pp. 1630-1632, Sep. 1997.

Formula

a(n) = ceiling(binomial(n, w) * 2^w / (2*n + 1)) with w=4.

Crossrefs

Sequence in context: A192136 A031327 A193389 * A240279 A327728 A000158

Adjacent sequences: A030501 A030502 A030503 * A030505 A030506 A030507

Keyword

nonn

Author

Mattias Svanstrom (mattias(AT)isy.liu.se)

Status

approved