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A130772
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Periodic sequence with period 2 2 0 -2 -2 0.
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7
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2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2, 0, -2, -2, 0, 2, 2
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OFFSET
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0,1
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COMMENTS
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Sequence is identical to its third differences.
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LINKS
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FORMULA
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EXAMPLE
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G.f. = 2 + 2*x - 2*x^3 - 2*x^4 + 2*x^6 + 2*x^7 - 2*x^9 - 2*x^10 + ...
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MATHEMATICA
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PadRight[{}, 120, {2, 2, 0, -2, -2, 0}] (* or *) LinearRecurrence[{1, -1}, {2, 2}, 120] (* Harvey P. Dale, Jan 13 2014 *)
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PROG
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(Magma) I:=[2, 2]; [n le 2 select I[n] else Self(n-1) - Self(n-2): n in [1..30]]; // G. C. Greubel, Aug 04 2018
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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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