id:A030507 - OEIS Search Results

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Graham-Sloane-type lower bound on the size of a ternary (n,3,7) constant-weight code.

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9, 61, 243, 732, 1837, 4056, 8136, 15149, 26571, 44374, 71125, 110094, 165376, 242014, 346136, 485103, 667662, 904109, 1206463, 1588650, 2066688, 2658897, 3386099, 4271843, 5342629, 6628148, 8161525, 9979578, 12123079, 14637028 (list; graph; listen)

	OFFSET	`7,1`
	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: A086018 A138589 A058777 this_sequence A005060 A125346 A016200` `Adjacent sequences: A030504 A030505 A030506 this_sequence A030508 A030509 A030510`
	KEYWORD	`nonn`
	AUTHOR	`Mattias Svanstrom (mattias(AT)isy.liu.se)`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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