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A030504 Graham-Sloane-type lower bound on the size of a ternary (n,3,4) constant-weight code. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,1
LINKS
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
KEYWORD
nonn
AUTHOR
Mattias Svanstrom (mattias(AT)isy.liu.se)
STATUS
approved

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Last modified February 24 07:07 EST 2024. Contains 370294 sequences. (Running on oeis4.)