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 A217751 #7 Mar 23 2013 15:11:41 %S A217751 0,0,0,0,0,0,0,0,22,48,78,84,240,128,306 %N A217751 Number of pentagonal regions in the exterior of a regular n-gon with all diagonals drawn. %Y A217751 Cf. A067152, A217746. %K A217751 nonn %O A217751 3,9 %A A217751 _Martin Renner_, Mar 23 2013