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%I #8 Sep 13 2017 11:13:15
%S 1,4,370,2393680,1813074253296
%N Number of matchings in the n X n rook complement graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Matching.html">Matching</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/RookComplementGraph.html">Rook Complement Graph</a>
%K nonn,more
%O 1,2
%A _Eric W. Weisstein_, Sep 11 2017