id:A135530 - OEIS Search Results

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a(n)=a(n-1)+2a(n-2)-2a(n-3).

+0
11

2, 1, 4, 2, 8, 4, 16, 8, 32, 16, 64, 32, 128, 64, 256, 128, 512, 256, 1024, 512, 2048, 1024, 4096, 2048, 8192, 4096, 16384, 8192, 32768, 16384, 65536, 32768, 131072, 65536, 262144, 131072, 524288, 262144, 1048576 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`O.g.f.: -(2+x)/(2x^2-1). a(n)= 2a(n-2). a(n) = A077957(n+1)+A077957(n+2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2008` `a(n)=2^[(1/2)n]+(-sqrt(2))^n-(1/4)sqrt(2)(-sqrt(2))^n+(1/4)2^[(1/2)n]sqrt(2) - Paolo P. Lava (ppl(AT)spl.at), Jun 06 2008`
	CROSSREFS	`Sequence in context: A117000 A082392 A085086 this_sequence A137206 A076736 A106489` `Adjacent sequences: A135527 A135528 A135529 this_sequence A135531 A135532 A135533`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Feb 20 2008`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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