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1, 1, -4, 0, 20, -25, -71, 216, 94, -1220, 1037, 4941, -11440, -11008, 72112, -33453, -326675, 577060, 950750, -4129272, 279257, 20740793, -27217100, -72078336, 228625372, 83808415, -1271796511, 1153458144, 5060707454, -12183603100, -10694679515, 75519944325, -39290857304, -336819940736
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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G.f.: (1 + 2*x + 2*x^2) / (1 + x + 5*x^2 - x^3 + x^4).
a(n) = -a(n-1) - 5*a(n-2) + a(n-3) - a(n-4) for n>3.
(End)
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MATHEMATICA
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CoefficientList[ Series[(1 +2x +2x^2)/(1 +x +5x^2 -x^3 +x^4), {x, 0, 33}], x] (* or *)
LinearRecurrence[{-1, -5, 1, -1}, {1, 1, -4, 0}, 33] (* Robert G. Wilson v, Dec 27 2017 *)
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PROG
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(PARI) Vec((1 + 2*x + 2*x^2) / (1 + x + 5*x^2 - x^3 + x^4) + O(x^40)) \\ Colin Barker, Dec 27 2017
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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