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A030508
Graham-Sloane-type lower bound on the size of a ternary (n,3,8) constant-weight code.
0
16, 122, 549, 1837, 5069, 12203, 26510, 53141, 99840, 177811, 302759, 496128, 786545, 1211476, 1819136, 2670647, 3842461, 5429083, 7546084, 10333440, 13959209, 18623545, 24563096, 32055772, 41425920, 53049910, 67362149, 84861549, 106118453, 131782042, 162588234
OFFSET
8,1
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=8.
CROSSREFS
Sequence in context: A068880 A053883 A191484 * A006215 A227088 A060633
KEYWORD
nonn
AUTHOR
Mattias Svanstrom (mattias(AT)isy.liu.se)
STATUS
approved