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A130772
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Periodic sequence with period 2 2 0 -2 -2 0.
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5
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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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Table of n, a(n) for n=0..49.
Index entries for sequences related to linear recurrences with constant coefficients, signature (1,-1).
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FORMULA
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a(n) = -(1/3)*{(n mod 6)+[(n+1) mod 6]-[(n+3) mod 6]-[(n+4) mod 6]}, with n>=0. - Paolo P. Lava, Jul 18 2007
O.g.f.: 2/(x^2-x+1). a(n) = 2*A010892(n) . - R. J. Mathar, Feb 14 2008
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PROG
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(PARI) for(i=1, 9, print1("2, 2, 0, -2, -2, 0, ")) \\ Charles R Greathouse IV, Jun 02 2011
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CROSSREFS
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Sequence in context: A114700 A140666 A202145 * A109265 A184334 A225399
Adjacent sequences: A130769 A130770 A130771 * A130773 A130774 A130775
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KEYWORD
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sign,easy,changed
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AUTHOR
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Paul Curtz, Jul 14 2007
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STATUS
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approved
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