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A079285
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First differences of A079284.
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0
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0, 2, 1, 5, 4, 13, 13, 34, 39, 89, 112, 233, 313, 610, 859, 1597, 2328, 4181, 6253, 10946, 16687, 28657, 44320, 75025, 117297, 196418, 309619, 514229, 815656, 1346269, 2145541, 3524578, 5637351, 9227465, 14799280, 24157817
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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)=Fib(n+2)-2^floor(n/2)(1-(1)^(n+1))/2
G.f.: -x*(-2+x+2*x^2) / ( (x^2+x-1)*(2*x^2-1) ). - R. J. Mathar, Feb 13 2015
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EXAMPLE
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a(2n) = Fib(2n+2) - 2^(n/2). a(2n+1) = Fib(2n+3)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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