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Search: id:A133671
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| A133671 |
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a(n)=a(n-1)-64*a(n-2), a(0)=1, a(1)=8 . |
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+0
2
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| 1, 8, -56, -568, 3016, 39368, -153656, -2673208, 7160776, 178246088, -280043576, -11687793208, 6234995656, 754253760968, 355214038984, -47917026662968, -70650725157944, 2996038981272008, 7517685391380424, -184228809410028088
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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G.f.:(1+7*x)/(1-x+64*x^2).
a(n)=Sum_{k, 0<=k<=n}A133607(n,k)*8^k. - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 30 2007
a(n)=-(1/34)*I*sqrt(255)*[1/2+(1/2)*I*sqrt(255)]^n+(1/2)*[1/2+(1/2)*I*sqrt(255)]^n+(1 /34)*I*sqrt(255)*[1/2-(1/2)*I*sqrt(255)]^n+(1/2)*[1/2-(1/2)*I*sqrt(255)]^n, with n>=0 and I=sqrt(-1) [From Paolo P. Lava (ppl(AT)spl.at), Aug 28 2008]
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CROSSREFS
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Sequence in context: A086787 A098914 A009107 this_sequence A105850 A009089 A043071
Adjacent sequences: A133668 A133669 A133670 this_sequence A133672 A133673 A133674
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KEYWORD
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easy,sign
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 29 2007
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