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Search: id:A135949
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| 1, -1, 1, -3, 3, -13, 9, -59, 19, -277, -23, -1347, -669, -6781, -6039, -35243, -43757, -188293, -289271, -1028979, -1822941, -5723437, -11172663, -32263067, -67310189, -183660661, -401077079, -1052923683, -2372706717, -6066772573
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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a(n)=(5/14)*[1+sqrt(2)]^n+(2/7)*sqrt(2)*[1-sqrt(2)]^n+(2/7)*(-2)^n+(5/14)*[1-sqrt(2)]^n-(2/7) *[1+sqrt(2)]^n*sqrt(2), with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 09 2008
G.f.: (1-x-4x^2)/((1+2x)(1-2x-x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]
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CROSSREFS
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Sequence in context: A107330 A076509 A020550 this_sequence A141245 A147032 A146261
Adjacent sequences: A135946 A135947 A135948 this_sequence A135950 A135951 A135952
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KEYWORD
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sign,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Mar 02 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009
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