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 A176005 #7 Mar 31 2012 10:26:26
%S A176005 1,1,0,-1,-3,0,3,11,24,45,75,125,175,245,91,24,0,-24,-5,-1,0,1,-3,-7,
%T A176005 -11,-15,-19,-23,-16,-9,-5,0,0,0,-5,-11,-24,-37,-35,-33,-27,-21,-11,
%U A176005 -1,13,0,-13,-27,-41,-55,-69,0,69,221,485,344,240,136,69,27,-15,-32,-36
%N A176005 Det(M) where M is an n X n matrix with M(i,j) = floor(cos(i-j)).
%t A176005 M[n_]:=Table[Floor[Cos[i - j]], {i, n}, {j, n}];aux=Table[Det[M[n]],{n,150}]; ListPlot[aux] (*chaotic graph*)
%K A176005 sign
%O A176005 1,5
%A A176005 _José María Grau Ribas_, Apr 05 2010