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A135695
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Period 6: repeat [-1, -1, -2, -2, 3, 3].
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1
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-1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1
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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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a(n) = a(n-6) for n>5. a(n) = -a(n-2) - a(n-4) for n>3.
G.f.: -(x+1)*(3*x^2+1)/((x^2-x+1)*(x^2+x+1)). (End)
a(n) = (3*cos(n*Pi/3) - 9*cos(2*n*Pi/3) - 9*sqrt(3)*sin(n*Pi/3) + sqrt(3)*sin(2*n*Pi/3))/6. - 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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