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 A362509 #9 Feb 16 2025 08:34:05 %S A362509 0,0,9,87,2940,67392,6075837,442152975,133476737988 %N A362509 Number of vertex cuts in the n X n black bishop graph. %H A362509 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a> %H A362509 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/VertexCut.html">Vertex Cut</a> %F A362509 a(n) = 2^ceiling(n^2/2) - 1 - A290719(n). - _Pontus von Brömssen_, Apr 23 2023 %Y A362509 Cf. A290719. %K A362509 nonn,more %O A362509 1,3 %A A362509 _Eric W. Weisstein_, Apr 23 2023 %E A362509 a(8)-a(9) (based on data in A290719) from _Pontus von Brömssen_, Apr 23 2023