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1, 5, -7, 29, -79, 245, -727, 2189, -6559, 19685, -59047, 177149, -531439, 1594325, -4782967, 14348909, -43046719, 129140165, -387420487, 1162261469, -3486784399, 10460353205, -31381059607, 94143178829, -282429536479, 847288609445, -2541865828327, 7625597484989
(list;
graph;
refs;
listen;
history;
text;
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+7*x)/((1-x)*(1+3*x)).
E.g.f. 2*exp(x)-exp(-3*x)
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MATHEMATICA
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LinearRecurrence[{-2, 3}, {1, 5}, 30] (* Harvey P. Dale, Mar 25 2013 *)
CoefficientList[Series[(1 + 7 x) / ((1 - x) (1 + 3 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Aug 09 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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