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 A164101 #3 Aug 15 2019 00:44:07 %S A164101 1,4,26,214,2320,31858,518697,9372645 %N A164101 Number of planar graphs with n nodes and chromatic number 4. %K A164101 nonn %O A164101 4,2 %A A164101 _Keith Briggs_, Aug 10 2009 %E A164101 Added term 9372645 (for n=11), _Keith Briggs_, Aug 25 2009