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%I #3 Nov 10 2007 03:00:00
%S 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,
%T -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,
%U -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
%N a(n)=sum((-1)^i*a(i),i=n-9..n-1); with a(i)=i for i=1..9.
%F a(n+20)=a(n)
%K easy,sign
%O 1,2
%A Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 10 1999
%E More terms from Larry Reeves (larryr(AT)acm.org), Feb 05 2001
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