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 A130772 Periodic sequence with period 2 2 0 -2 -2 0. 5
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Sequence is identical to its third differences. LINKS FORMULA 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 PROG (PARI) for(i=1, 9, print1("2, 2, 0, -2, -2, 0, ")) \\ Charles R Greathouse IV, Jun 02 2011 CROSSREFS Sequence in context: A114700 A140666 A202145 * A109265 A184334 A225399 Adjacent sequences:  A130769 A130770 A130771 * A130773 A130774 A130775 KEYWORD sign,easy,changed AUTHOR Paul Curtz, Jul 14 2007 STATUS approved

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