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 A092151 #3 Mar 31 2012 13:21:57 %S A092151 0,-6,-3,1,-5,0,-7,0,0,4,-11,-5,-13,8,7,0,-17,0,-19,-9,11,16,-23,0,0, %T A092151 20,0,-13,-29,-20,-31,0,19,28,23,0,-37,32,23,0,-41,-28,-43,-21,0,40, %U A092151 -47,0,0,0 %N A092151 A092673(n)*A092674(n). %K A092151 sign %O A092151 1,2 %A A092151 _Jon Perry_, Mar 31 2004