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A131608
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Period 24: repeat 1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9.
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0
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1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9, 1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9, 1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9, 1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9
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refs;
listen;
history;
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OFFSET
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0,3
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,-1).
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FORMULA
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a(n)= -a(n-12).
G.f. (1+x)*(1+x+x^2)*(x^2-x+1)*(9*x^6-6*x^5+4*x^3+2*x^2+1) / ( (1+x^4)*(x^8-x^4+1) ). - R. J. Mathar, Oct 08 2011
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MATHEMATICA
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PadRight[{}, 100, {1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9, -1, -1, -3, -7, -7, -1, -9, -9, -7, -3, -3, -9}] (* Harvey P. Dale, Jun 09 2015 *)
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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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