This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A115953 #14 Dec 14 2023 05:32:57
%S A115953 1,-1,0,0,1,-2,1,0,0,-1,1,-1,1,-1,0,0,1,-2,1,0,0,-1,1,-1,1,-1,0,0,1,
%T A115953 -2,1,0,0,-1,1,-1,1,-1,0,0,1,-2,1,0,0,-1,1,-1,1,-1,0,0,1,-2,1,0,0,-1,
%U A115953 1,-1,1,-1,0,0,1,-2,1,0,0,-1,1,-1
%N A115953 Periodic {1,-1,0,0,1,-2,1,0,0,-1,1,-1}.
%C A115953 Diagonal sums of number triangle A115952.
%H A115953 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,0,1,1,1)
%F A115953 G.f.: (1-x^3-x^5)/((1-x^3)(1+x+x^2+x^3))
%t A115953 LinearRecurrence[{-1,-1,0,1,1,1},{1,-1,0,0,1,-2},80] (* or *) PadRight[{},80,{1,-1,0,0,1,-2,1,0,0,-1,1,-1}] (* _Harvey P. Dale_, Jan 28 2023 *)
%K A115953 easy,sign
%O A115953 0,6
%A A115953 _Paul Barry_, Feb 02 2006