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 A156176 #2 Mar 30 2012 16:51:15 %S A156176 23,257543,27138236663,11828536957233383,14639678925928297567703, %T A156176 41393949926819051111431239623,231969423543894989257690172433129143, %U A156176 2330640193014931063017585202490874608196263,38966520031501064708241399303059964064529134680983,1023409776429490887726960719866571404072100379273323303303 %N A156176 A bisection of A002439. %K A156176 nonn %O A156176 0,1 %A A156176 _N. J. A. Sloane_, Nov 07 2009