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A030506 Graham-Sloane-type lower bound on the size of a ternary (n,3,6) constant-weight code. 0
5, 30, 106, 283, 640, 1286, 2366, 4068, 6628, 10333, 15531, 22631, 32111, 44525, 60504, 80766, 106117, 137460, 175799, 222244, 278014, 344448, 423007, 515276, 622978, 747968, 892251, 1057976, 1247448, 1463131, 1707654 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

LINKS

Table of n, a(n) for n=6..36.

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) = ceil (binomial (n, w) * 2^w / (2*n + 1))

CROSSREFS

Sequence in context: A288679 A071252 A174002 * A062990 A018213 A047661

Adjacent sequences:  A030503 A030504 A030505 * A030507 A030508 A030509

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified October 23 05:50 EDT 2018. Contains 316519 sequences. (Running on oeis4.)