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1, 11, 89, 659, 4721, 33371, 234569, 1644899, 11523041, 80687531, 564891449, 3954476339, 27682042961, 193776426491, 1356441362729, 9495108670979, 66465818092481, 465260898834251, 3256826808400409, 22797789208484819
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listen;
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internal format)
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1+x)/((1-7*x)*(1-3*x)).
E.g.f. 2*exp(7*x)-exp(3*x).
a(0)=0, a(1)=11; for n>1, a(n) = 10*a(n-1) -21*a(n-2). - Vincenzo Librandi Aug 10 2013
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MATHEMATICA
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CoefficientList[Series[(1 + x) / ((1 - 7 x) (1 - 3 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Aug 10 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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