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 A359989 #7 Feb 16 2025 08:34:04 %S A359989 0,11,3665,16222021,1089224690733,1150229180575982641, %T A359989 19332960184149905415396841,5191795779341747010730275139276101, %U A359989 22300392508126626453613075681944644703634073,1532492114568208344599582951444206568577948454351297761 %N A359989 Number of edge cuts in the n X n grid graph. %H A359989 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EdgeCut.html">Edge Cut</a> %H A359989 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a> %F A359989 a(n) = A053765(n) - A359992(n). %e A359989 The a(2) = 11 edge cuts are the following subgraphs and their rotations and reflections. The illustrations show the edge sets that must be removed to disconnect the graph. %e A359989 o---o o---o o---o o---o %e A359989 | | | | %e A359989 o o o---o o---o o---o %e A359989 The first two of these show minimal edge cuts. %Y A359989 Main diagonal of A359990. %Y A359989 Cf. A053765, A286913, A359992. %K A359989 nonn %O A359989 1,2 %A A359989 _Andrew Howroyd_, Jan 28 2023