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 A292623 #15 Feb 16 2025 08:33:51
%S A292623 1,1,1,3,4,11,23,69,178,567,1741,5890,20005,71294,257889,958595
%N A292623 Number of median graphs on n nodes.
%H A292623 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MedianGraph.html">Median Graph</a>
%e A292623 n = 1: singleton graph K_1 (1 graph)
%e A292623 n = 2: P_2 = K_2 (1 graph)
%e A292623 n = 3: P_3 (1 graph)
%e A292623 n = 4: K_{1,3}, P_4, square graph P_2 X P_2 (3 graphs)
%e A292623 n = 5: banner graph, fork graph, P_5, S_5 = K_{1,4} (4 graphs)
%e A292623 Here, X denotes the graph Cartesian product
%K A292623 nonn,more
%O A292623 1,4
%A A292623 _Eric W. Weisstein_, Sep 20 2017
%E A292623 a(11)-a(16) from _Brendan McKay_, Apr 15 2019