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A206374
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a(n) = (7*4^n - 1)/3.
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7
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2, 9, 37, 149, 597, 2389, 9557, 38229, 152917, 611669, 2446677, 9786709, 39146837, 156587349, 626349397, 2505397589, 10021590357, 40086361429, 160345445717, 641381782869, 2565527131477, 10262108525909, 41048434103637, 164193736414549, 656774945658197
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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CoefficientList[Series[(2-x)/(1-5*x+4*x^2), {x, 0, 30}], x] (* or *) LinearRecurrence[{5, -4}, {2, 9}, 30] (* Vincenzo Librandi, Mar 20 2012 *)
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PROG
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(Magma) [(7*4^n-1)/3 : n in [0..30]];
(PARI) vector(20, n, (7*4^(n-1)-1)/3) \\ Derek Orr, Apr 12 2015
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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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STATUS
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approved
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