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 A155500 #2 Mar 30 2012 17:26:28 %S A155500 41,44,49,56,65,76,89,104,121,140,161,164,169,176,184,185,196,209,224, %T A155500 236,241,260,265,281,296,304,329,356,361,364,369,376,385,396,401,409, %U A155500 416,424,440,441,449,460,481,484,504,521,524,529,556,560,569,585,601 %N A155500 Numbers of form x^2+40y^2 with positive x,y. %K A155500 nonn %O A155500 1,1 %A A155500 _Zak Seidov_, Jan 23 2009