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 A126739 #9 Aug 15 2019 16:51:36 %S A126739 0,0,0,0,1,4,46,809,27794,1890221,248580644 %N A126739 Number of connected graphs on n nodes with chromatic number 5. %H A126739 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a> %Y A126739 A diagonal of triangle in A126736. %K A126739 nonn %O A126739 1,6 %A A126739 _N. J. A. Sloane_, Feb 16 2007 %E A126739 a(11) from _Michael Sollami_, Jan 29 2012