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 A289198 #13 Feb 16 2025 08:33:48 %S A289198 1,2,84,22368,84961440,5429866337280,7315512116927938560, %T A289198 235781588994736418036121600,207456452048917943576497565466624000, %U A289198 5583211401338046269360238971594326671360000000,5098207942457032504011606690585598401287135271321600000000 %N A289198 Number of maximal matchings in the n X n rook graph. %H A289198 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a> %H A289198 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Matching.html">Matching</a> %H A289198 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MaximalIndependentEdgeSet.html">Maximal Independent Edge Set</a> %H A289198 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a> %Y A289198 Main diagonal of A341847. %Y A289198 Cf. A270228, A281433, A289197, A292196. %K A289198 nonn %O A289198 1,2 %A A289198 _Eric W. Weisstein_, Jun 28 2017 %E A289198 a(1) changed and a(5)-a(11) from _Andrew Howroyd_, Oct 05 2017