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 A117201 #3 Mar 30 2012 18:59:14 %S A117201 1,0,0,1,1,1,1,0,1,0,1,-1,1,0,0,1,1,-1,1,1,0,0,1,2,1,0,0,1,1,1,1,0,0, %T A117201 0,1,3,1,0,0,0,1,1,1,1,1,0,1,-2,1,0,0,1,1,2,1,0,0,0,1,-1,1,0,1,1,1,1, %U A117201 1,1,0,0,1,-4,1,0,0,1,1,1,1,1,1 %N A117201 Row sums of number triangle A117200. %K A117201 sign %O A117201 0,24 %A A117201 _Paul Barry_, Mar 02 2006