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 A126740 #9 Aug 15 2019 16:52:01 %S A126740 0,0,0,0,0,1,5,74,1940,113272,14545025 %N A126740 Number of connected graphs on n nodes with chromatic number 6. %H A126740 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a> %Y A126740 A diagonal of triangle in A126736. %K A126740 nonn %O A126740 1,7 %A A126740 _N. J. A. Sloane_, Feb 16 2007 %E A126740 a(11) from _Michael Sollami_, Jan 29 2012