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%I #25 May 06 2019 20:55:18
%S 0,2,32,6432,19497984,1109403156480,1380937534541660160
%N Number of directed Hamiltonian circuits in the n-triangular 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/TriangularGraph.html">Triangular Graph</a>
%K nonn,more
%O 2,2
%A _Eric W. Weisstein_, Apr 10 2007
%E a(6) from _Alois P. Heinz_, Nov 29 2010
%E a(7)-a(8) from _Eric W. Weisstein_, Mar 31 2014
%E Missing factor of 2 applied to a(8) by _Eric W. Weisstein_, Apr 08 2014
%E Offset corrected by _Eric W. Weisstein_, May 06 2019
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