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A030511
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Graham-Sloane-type lower bound on the size of a ternary (n,3,3) constant-weight code.
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2
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2, 6, 10, 16, 24, 32, 42, 54, 66, 80, 96, 112, 130, 150, 170, 192, 216, 240, 266, 294, 322, 352, 384, 416, 450, 486, 522, 560, 600, 640, 682, 726, 770, 816, 864, 912, 962, 1014, 1066, 1120, 1176, 1232, 1290, 1350, 1410, 1472, 1536, 1600
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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LINKS
| M. Svanstrom, A lower bound for ternary constant weight codes, IEEE Trans. on Information Theory, Vol. 43, pp. 1630-1632, Sep. 1997.
Index to sequences with linear recurrences with constant coefficients, signature (2,-1,1,-2,1).
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FORMULA
| a(n) = 2 * (n - 1)^2 / 3, if n=1 (mod 3), a(n) = 2 * n * (n - 2) / 3, otherwise
G.f. -2*x^3*(1+x) / ( (1+x+x^2)*(x-1)^3 ). - R. J. Mathar, Aug 25 2011
a(n) = 2*A000212(n-1). - R. J. Mathar, Aug 25 2011
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CROSSREFS
| Sequence in context: A195957 A183575 A096184 * A071597 A100899 A099540
Adjacent sequences: A030508 A030509 A030510 * A030512 A030513 A030514
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KEYWORD
| nonn
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AUTHOR
| Mattias Svanstrom (mattias(AT)isy.liu.se)
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