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A152167
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a(n)=-a(n-1)+3*a(n-2), n>1 ; a(0)=1, a(1)=-3 .
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4
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1, -3, 6, -15, 33, -78, 177, -411, 942, -2175, 5001, -11526, 26529, -61107, 140694, -324015, 746097, -1718142, 3956433, -9110859, 20980158, -48312735, 111253209, -256191414, 589951041, -1358525283, 3128378406, -7203954255, 16589089473
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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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G.f.: (1-2*x)/(1+x-3*x^2).
a(n) = Sum{k=0..n} A147703(n,k)*(-4)^k.
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MATHEMATICA
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LinearRecurrence[{-1, 3}, {1, -3}, 30] (* Harvey P. Dale, Dec 24 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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