%I #42 May 06 2017 23:39:43
%S 1512,91392,5911400,1120056192,252824095384,187568248374272
%N Number of directed Hamiltonian paths on the n X n torus grid graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a>
%F a(n) = 2 * A268838(n). - _Andrew Howroyd_, May 06 2017
%K nonn,more
%O 3,1
%A _Eric W. Weisstein_, Nov 15 2016
%E a(7)-a(8) from _Andrew Howroyd_, May 06 2017