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A135694
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Period 6: repeat [1, -1, -1, -1, 0, 2].
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1
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1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2, 1, -1, -1, -1, 0, 2
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OFFSET
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0,6
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LINKS
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FORMULA
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a(n) = a(n-6) for n>5. a(n) = -a(n-2) - a(n-4) for n>3.
G.f.: (1-x-2*x^3)/((x^2-x+1)*(x^2+x+1)). (End)
a(n) = (3*cos(n*Pi/3) - 8*sqrt(3)*cos(n*Pi/6)^3*sin(n*Pi/6))/3. - Wesley Ivan Hurt, Jun 22 2016
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MAPLE
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MATHEMATICA
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PROG
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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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EXTENSIONS
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STATUS
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approved
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