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A144476
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Four interlaced copies of A117373.
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0
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1, 1, -1, 3, -2, -2, 2, 1, -3, -3, 3, -2, -1, -1, 1, -3, 2, 2, -2, -1, 3, 3, -3, 2, 1, 1, -1, 3, -2, -2, 2, 1, -3, -3, 3, -2, -1, -1, 1, -3, 2, 2, -2, -1, 3, 3, -3, 2, 1, 1, -1
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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FORMULA
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G.f.: -x*(2*x^7-3*x^6+3*x^5+3*x^4-3*x^3+x^2-x-1) / (x^8-x^4+1). - Colin Barker, Apr 11 2013
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MATHEMATICA
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Clear[M, v, n, a] M[0] = {{0, -1}, {1, 1}}; M[1] = {{1, 0}, {1, 1}}; M[2] = {{-1, 0}, {1, 1}}; M[3] = {{0, 1}, {1, 1}}; v[0] = {1, 1}; v[n_] := v[n] = M[Mod[n, 4]].v[n - 1]; a = Table[v[n][[1]], {n, 0, 50}]
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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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