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%I #6 May 06 2019 20:55:50
%S 0,1,4,396,553008,4701600128,1782158930138112,3276113857736492040192
%N Number of (undirected) Hamiltonian cycles in the n X n white bishop graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HamiltonianCycle.html">Hamiltonian Cycle</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/WhiteBishopGraph.html">White Bishop Graph</a>
%F a(n) = A282890(n)/2.
%Y Cf. A282890.
%K nonn,more,hard
%O 2,3
%A _Eric W. Weisstein_, May 06 2019