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%I #7 Mar 14 2021 18:44:54
%S 1,3,40,852,22368,822528,38772864,2462728320,189512165376,
%T 18739021676544,2147802505795584,305748136551647232,
%U 48922389407097077760,9484975881651606847488,2021636445616137313124352,512419728510195503179825152,140423343538080744846410121216
%N Number of maximal matchings in the 4 X n rook graph.
%H Andrew Howroyd, <a href="/A341849/b341849.txt">Table of n, a(n) for n = 0..30</a>
%Y Row n=4 of A341847.
%K nonn
%O 0,2
%A _Andrew Howroyd_, Feb 21 2021
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