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A168415
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a(n) = 2^n + 7.
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11
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8, 9, 11, 15, 23, 39, 71, 135, 263, 519, 1031, 2055, 4103, 8199, 16391, 32775, 65543, 131079, 262151, 524295, 1048583, 2097159, 4194311, 8388615, 16777223, 33554439, 67108871, 134217735, 268435463, 536870919, 1073741831, 2147483655
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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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a(n) = 2*a(n-1) - 7, n > 1.
G.f.: (8 - 15*x)/((2*x - 1)*(x - 1)). - R. J. Mathar, Jul 10 2011
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MATHEMATICA
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CoefficientList[Series[(8 - 15 x)/((2 x - 1) (x - 1)), {x, 0, 200}], x] (* Vincenzo Librandi, Sep 19 2013 *)
LinearRecurrence[{3, -2}, {8, 9}, 40] (* Harvey P. Dale, Mar 03 2014 *)
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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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STATUS
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approved
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