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%I #13 Nov 24 2020 01:49:15
%S 0,0,4,704,553008,13802629632,1782158930138112,14231924675064000331776
%N Number of (undirected) Hamiltonian cycles in the n X n black bishop graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HamiltonianCycle.html">Hamiltonian Cycle</a>
%F a(n) = A282889(n)/2.
%Y Cf. A282889, A307929.
%K nonn,hard,more
%O 2,3
%A _Eric W. Weisstein_, May 06 2019
%E Offset corrected and a(2) prepended by _Pontus von Brömssen_, Nov 22 2020
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