id:A130151 - OEIS Search Results

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Hexaperiodic sequence: repeat 1 1 1 -1 -1 -1 .

+0
4

1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`a(n)=3a(n-1)-a(n-3)+3a(n-4). - Paul Curtz (bpcrtz(AT)free.fr), Nov 22 2007`
	FORMULA	`a(0)=a(1)=a(2)=-a(3)=-a(4)=-a(5)=1, a(n+6)=a(n) n=0,1.. .` `a(n)=(1/3){-(n mod 6)+[(n+3) mod 6]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Aug 28 2007` `a(n) = ((-1)^n (4 * (cos((2n + 1)Pi/3) + cos(nPi)) + 1) - 4) / 3. - Federico Acha Neckar (f0383864(AT)hotmail.com), Sep 01 2007` `a(n) = (-1)^n (4 * cos((2n + 1) Pi/3) + 1) / 3. - Federico Acha Neckar (f0383864(AT)hotmail.com), Sep 02 2007` `G.f.: (1+x+x^2)/(1+x)/(x^2-x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007`
	CROSSREFS	`Cf. A131561.` `Cf. A131531.` `Sequence in context: A112865 A121241 A122188 this_sequence A131561 A065357 A071935` `Adjacent sequences: A130148 A130149 A130150 this_sequence A130152 A130153 A130154`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Aug 03 2007`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

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