%I #14 Dec 14 2023 05:31:55
%S 1,1,-2,0,1,0,-1,0,0,1,-1,-1,1,1,-2,0,1,0,-1,0,0,1,-1,-1,1,1,-2,0,1,0,
%T -1,0,0,1,-1,-1,1,1,-2,0,1,0,-1,0,0,1,-1,-1,1,1,-2,0,1,0,-1,0,0,1,-1,
%U -1,1,1,-2,0,1,0,-1,0,0,1,-1,-1
%N Periodic {1,1,-2,0,1,0,-1,0,0,1,-1,-1}.
%C Diagonal sums of number triangle A115524.
%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,0,1,1,1).
%F G.f.: (1+2x-x^3-2x^4-x^5)/(1+x+x^2-x^4-x^5-x^6).
%t PadRight[{},120,{1,1,-2,0,1,0,-1,0,0,1,-1,-1}] (* _Harvey P. Dale_, Aug 20 2021 *)
%K easy,sign
%O 0,3
%A _Paul Barry_, Jan 25 2006