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A165639
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a(n)=(7/4)*(1+3*(-7)^(n-1)).
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1
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1, 7, -35, 259, -1799, 12607, -88235, 617659, -4323599, 30265207, -211856435, 1482995059, -10380965399, 72666757807, -508667304635, 3560671132459, -24924697927199, 174472885490407, -1221310198432835, 8549171389029859
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n)=(-7)*a(n-1)+14 with a(0)=1. a(0)=1, a(1)=7, a(n)=7*a(n-2)-6*a(n-1). G.f.: (1+13x)/(1+6x-7x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*6^(n-k).
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MATHEMATICA
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LinearRecurrence[{-6, 7}, {1, 7}, 30] (* Harvey P. Dale, Jun 05 2016 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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