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Search: id:A155132
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| A155132 |
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a(n)=8*a(n-1)+8*a(n-2), n>2 ; a(0)=1, a(1)=7, a(2)=63 . |
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1
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| 1, 7, 63, 560, 4984, 44352, 394688, 3512320, 31256064, 278147072, 2475225088, 22026977280, 196017618944, 1744356769792, 15522995109888, 138138815037440, 1229294481178624, 10939466369728512, 97350086807257088
(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-x-x^2)/(1-8*x-8*x^2) .
a(n)=(35/24)*sqrt(6)*{[4+2*sqrt(6)]^(n-1)-[4-2*sqrt(6)]^(n-1)}+(7/2)*[4+2*sqrt(6)]^(n-1)+[4-2*sqrt(6)]^(n-1)}+(1/8)*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 26 2009]
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CROSSREFS
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Sequence in context: A166153 A123009 A024088 this_sequence A015684 A051579 A049464
Adjacent sequences: A155129 A155130 A155131 this_sequence A155133 A155134 A155135
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jan 20 2009
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