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 A289197 #9 Feb 16 2025 08:33:48 %S A289197 1,2,72,2016,22615200,61903180800,383946391896883200, %T A289197 291754347175555891200000,1589674150230421751470227456000000, %U A289197 653674192758917925444914420184514560000000,4669210639701352189820773315967264103247065907200000000 %N A289197 Number of maximum matchings in the n X n rook graph. %H A289197 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a> %H A289197 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Matching.html">Matching</a> %H A289197 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MaximumIndependentEdgeSet.html">Maximum Independent Edge Set</a> %H A289197 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a> %Y A289197 Main diagonal of A341850. %Y A289197 Cf. A270228, A289198. %K A289197 nonn %O A289197 1,2 %A A289197 _Eric W. Weisstein_, Jun 28 2017 %E A289197 Terms a(7) and beyond from _Andrew Howroyd_, Feb 21 2021