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A135949
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a(n)=5a(n-2)+2a(n-3).
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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,4
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FORMULA
| 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 (paoloplava(AT)gmail.com), 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
| Sequence in context: A206704 A020550 A200921 * A168234 A141245 A147032
Adjacent sequences: A135946 A135947 A135948 * A135950 A135951 A135952
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KEYWORD
| sign,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Mar 02 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009
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