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 A348620 #8 Feb 16 2025 08:34:02
%S A348620 1,3,8,26,94,476,3487,44110,1042221,48069505
%N A348620 Total of the chromatic numbers of all simple graphs on n nodes.
%H A348620 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChromaticNumber.html">Chromatic Number</a>
%H A348620 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SimpleGraph.html">Simple Graph</a>
%F A348620 a(n) = Sum_{k=1..n} k*A084268(n,k). - _Andrew Howroyd_, Jan 10 2022
%Y A348620 Cf. A084268.
%K A348620 nonn,more
%O A348620 1,2
%A A348620 _Eric W. Weisstein_, Oct 25 2021