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 A285765 #16 Feb 16 2025 08:33:44
%S A285765 1,15,495,64815,33478163,68694593248
%N A285765 Number of connected induced (non-null) subgraphs of the n X n queen graph.
%H A285765 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/QueenGraph.html">Queen Graph</a>
%H A285765 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Vertex-InducedSubgraph.html">Vertex-Induced Subgraph</a>
%t A285765 Table[g = GraphData[{"Queen", {n, n}}]; -1 + ParallelSum[ Boole@ ConnectedGraphQ@ Subgraph[g, s], {s, Subsets@ Range[n^2]}], {n, 4}]
%Y A285765 Cf. A020873 (wheel), A059020 (ladder), A059525 (grid), A286139 (king), A286182 (prism), A286183 (antiprism), A286184 (helm), A286185 (Möbius ladder), A286186 (friendship), A286187 (web), A286188 (gear), A286189 (rook).
%K A285765 nonn,more
%O A285765 1,2
%A A285765 _Giovanni Resta_, May 04 2017