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13, 26, 52, 104, 208, 416, 832, 1664, 3328, 6656, 13312, 26624, 53248, 106496, 212992, 425984, 851968, 1703936, 3407872, 6815744, 13631488, 27262976, 54525952, 109051904, 218103808, 436207616, 872415232, 1744830464, 3489660928, 6979321856, 13958643712
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listen;
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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), n>0; a(0)=13. G.f.: 13/(1-2*x). - Philippe Deléham, Nov 23 2008
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MATHEMATICA
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CoefficientList[Series[13 / (1 - 2 x), {x, 0, 50}], x] (* Vincenzo Librandi, Jun 08 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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STATUS
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approved
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