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 A164099 #6 Aug 15 2019 00:42:25 %S A164099 1,2,6,12,33,83,273,937,3983,18871,103697,628245,4161652,29372754, %T A164099 218035754 %N A164099 Number of planar graphs with n nodes and chromatic number 2. %F A164099 (Euler transform of A243321) - 1. - _Falk Hüffner_, May 10 2019 %K A164099 nonn %O A164099 2,2 %A A164099 _Keith Briggs_, Aug 10 2009 %E A164099 Added term 18871 (for n=11), _Keith Briggs_, Aug 25 2009 %E A164099 a(12)-a(16) from formula by _Falk Hüffner_, May 10 2019