login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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; 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) = ceil (binomial (n, w) * 2^w / (2*n + 1))

CROSSREFS

Sequence in context: A192136 A031327 A193389 * A000158 A101427 A126877

Adjacent sequences:  A030501 A030502 A030503 * A030505 A030506 A030507

KEYWORD

nonn

AUTHOR

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 13 21:09 EST 2012. Contains 205561 sequences.