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 A052311 #8 Dec 19 2015 12:58:43 %S A052311 1,-1,1,0,-1,1,0,0,-1,1,0,1,-1,-1,1,0,0,1,-1,-1,1,0,-1,3,0,-2,-1,1,0, %T A052311 -2,1,3,0,-2,-1,1,0,-1,-7,7,5,-1,-3,-1,1,0,8,-21,-1,15,5,-3,-3,-1,1,0, %U A052311 25,-19,-34,8,20,8,-4,-4,-1,1,0,26,71,-99,-62,30,40,4,-6,-4,-1,1,0 %N A052311 Triangle: Matrix inverse of A047996. %H A052311 <a href="/index/Ne#necklaces">Index entries for sequences related to necklaces</a> %e A052311 1; -1,1; 0,-1,1; 0,0,-1,1; 0,1,-1,-1,1; ... %Y A052311 Column 1 in A052312. %K A052311 sign,tabl %O A052311 0,24 %A A052311 _Christian G. Bower_, Dec 15 1999