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 A051796 a(n)=sum((-1)^i*a(i),i=n-9..n-1); with a(i)=i for i=1..9. 0
 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n+20)=a(n) CROSSREFS Sequence in context: A028900 A081596 A061500 * A257296 A093030 A122425 Adjacent sequences:  A051793 A051794 A051795 * A051797 A051798 A051799 KEYWORD easy,sign AUTHOR Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 10 1999 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), Feb 05 2001 STATUS approved

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Last modified October 20 00:50 EDT 2018. Contains 316378 sequences. (Running on oeis4.)