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A131720
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Period 6: repeat [0, 1, -1, 1, -1, 0].
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2
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0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, -1, 0
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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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a(n) = 1/6*cos(1/3*Pi*n)+1/6*3^(1/2)*sin(1/3*Pi*n)+1/2*cos(2/3*Pi*n)+1/6*3^(1/2)*sin(2/3*Pi*n)+2/3*(-1)^(1+n). - R. J. Mathar, Nov 15 2007
G.f.: x*(x^2+1) / ((x+1)*(x^2-x+1)*(x^2+x+1)). [Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009]
a(n) + a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) = 0 for n>4. - Wesley Ivan Hurt, Jun 20 2016
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MAPLE
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MATHEMATICA
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PadRight[{}, 100, {0, 1, -1, 1, -1, 0}] (* Harvey P. Dale, Aug 20 2015 *)
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PROG
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CROSSREFS
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KEYWORD
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sign,easy,less
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AUTHOR
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STATUS
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approved
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