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
KEYWORD
nonn
AUTHOR
Mattias Svanstrom (mattias(AT)isy.liu.se)
STATUS
approved