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 A217752 #7 Mar 23 2013 15:11:58 %S A217752 0,0,0,0,0,0,0,0,11,0,39,14,75,112,221 %N A217752 Number of hexagonal regions in the exterior of a regular n-gon with all diagonals drawn. %Y A217752 Cf. A067153, A217746. %K A217752 nonn %O A217752 3,9 %A A217752 _Martin Renner_, Mar 23 2013