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 A126751 #15 Jan 10 2023 07:26:59 %S A126751 0,0,1,1,6,30,232,2762,50814,1420183,58836784 %N A126751 Number of biconnected graphs on n nodes with chromatic number 3. %H A126751 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a> %Y A126751 A diagonal of triangle in A126749. %Y A126751 The sequence for "connected" is A126737. %K A126751 nonn,more %O A126751 1,5 %A A126751 _N. J. A. Sloane_, Feb 18 2007 %E A126751 a(11) from _Michael Sollami_, Feb 18 2012