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 A156169 #2 Mar 30 2012 16:51:15 %S A156169 7,33367,2237423527,715153093789687,698774745485355051847, %T A156169 1632180870878422847476890007,7791592461957309952817483706344167, %U A156169 68182479037890270018102486211434811414327,1009677846565093510000577124729596523472890660487,23798205151780687193785106278522250169201817256662802647 %N A156169 A bisection of A002437. %K A156169 nonn %O A156169 0,1 %A A156169 _N. J. A. Sloane_, Nov 06 2009