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2, 6, 30, 146, 698, 3358, 16342, 80298, 397170, 1972790, 9824654, 49005250, 244672042, 1222297422, 6108298566, 30531927002, 152630937314, 763068593254, 3815084686078, 19074648589554, 95370918424986, 476847618556286
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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G.f.: 2*(1-7*x+17*x^2-19*x^3)/((1-5*x)*(1-3*x)*(1-x)^2). - Vincenzo Librandi, Feb 26 2013
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MATHEMATICA
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Table[3^n + 5^n - 2 n, {n, 0, 30}] (* or *) CoefficientList[Series[2 (1 - 7 x + 17 x^2 - 19 x^3)/((1 - 5 x) (1 - 3 x) (1 - x)^2), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 26 2013 *)
LinearRecurrence[{10, -32, 38, -15}, {2, 6, 30, 146}, 30] (* Harvey P. Dale, Apr 27 2016 *)
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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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