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A081009
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a(n) = Fibonacci(4n+3) - 1, or Fibonacci(2n+2)*Lucas(2n+1).
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2
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1, 12, 88, 609, 4180, 28656, 196417, 1346268, 9227464, 63245985, 433494436, 2971215072, 20365011073, 139583862444, 956722026040, 6557470319841, 44945570212852, 308061521170128, 2111485077978049, 14472334024676220, 99194853094755496
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OFFSET
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0,2
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REFERENCES
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Hugh C. Williams, Edouard Lucas and Primality Testing, John Wiley and Sons, 1998, p. 75.
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LINKS
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FORMULA
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a(n) = 8*a(n-1) - 8*a(n-2) + a(n-3).
G.f.: (1+4*x)/((1-x)*(1-7*x+x^2)). - Colin Barker, Jun 24 2012
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MAPLE
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with(combinat) for n from 0 to 30 do printf(`%d, `, fibonacci(4*n+3)-1) od # James A. Sellers, Mar 03 2003
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MATHEMATICA
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LinearRecurrence[{8, -8, 1}, {1, 12, 88}, 30] (* Harvey P. Dale, Sep 23 2019 *)
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PROG
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(PARI) vector(30, n, n--; fibonacci(4*n+3)-1) \\ G. C. Greubel, Jul 14 2019
(Sage) [fibonacci(4*n+3)-1 for n in (0..30)] # G. C. Greubel, Jul 14 2019
(GAP) List([0..30], n-> Fibonacci(4*n+3)-1); # G. C. Greubel, Jul 14 2019
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CROSSREFS
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KEYWORD
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nonn,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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