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A168614
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a(n) = 2^n + 5.
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12
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6, 7, 9, 13, 21, 37, 69, 133, 261, 517, 1029, 2053, 4101, 8197, 16389, 32773, 65541, 131077, 262149, 524293, 1048581, 2097157, 4194309, 8388613, 16777221, 33554437, 67108869, 134217733, 268435461, 536870917, 1073741829, 2147483653
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 2*a(n-1) - 5 with n>0, a(0)=6.
a(n) = 3*a(n-1) - 2*a(n-2).
G.f.: (6 - 11*x)/((1-x)*(1-2*x)). (End)
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MATHEMATICA
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CoefficientList[Series[(6 - 11 x)/((1 - x) (1 - 2 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Sep 19 2013 *)
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PROG
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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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