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 A164100 #3 Aug 15 2019 00:43:31 %S A164100 1,3,16,82,524,4372,47057,618235,9289491 %N A164100 Number of planar graphs with n nodes and chromatic number 3. %K A164100 nonn %O A164100 3,2 %A A164100 _Keith Briggs_, Aug 10 2009 %E A164100 Added term 9289491 (for n=11), _Keith Briggs_, Aug 25 2009