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A076447
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Let v(1)=v(2)=v(3)=1, v(n)=(-1)^n*sign(v(n-1)-v(n-2))*v(n-3), then a(n) =1+v(n).
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0
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2, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2, 1, 0, 2, 1, 0, 0, 1, 0, 0
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OFFSET
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1,1
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,-1,1).
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FORMULA
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a(n) is a period-8 sequence with period (1, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 2, 1, 2, 2)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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