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A122879
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Periodic sequence of period 21.
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1
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0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2
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OFFSET
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1,8
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COMMENTS
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,-1,1,0,0,0,0,0,-1,1).
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FORMULA
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a(n+21) = a(n).
G.f.: -x^5*(2*x^10-x^7+x^3+1) / ((x-1)*(x^2+x+1)*(x^12-x^11+x^9-x^8+x^6 -x^4+x^3-x+1)). - Colin Barker, Dec 21 2012
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MATHEMATICA
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PadRight[{}, 120, {0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2}] (* Harvey P. Dale, Dec 27 2016 *)
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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STATUS
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approved
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