%I #17 May 14 2019 10:45:41
%S 0,6,240,95520,512386560,46817046743040,87639428459458068480
%N Number of directed Hamiltonian paths in the n-triangular 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/TriangularGraph.html">Triangular Graph</a>
%K nonn,more
%O 2,2
%A _Eric W. Weisstein_, Feb 20 2008
%E a(6) from _Eric W. Weisstein_, Dec 16 2013
%E a(7) from _Eric W. Weisstein_, Dec 24 2013
%E a(8) from _Eric W. Weisstein_, Feb 05 2014
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