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Number of (undirected) Hamiltonian cycles in the n-polygon diagonal intersection graph.
3

%I #22 Feb 16 2025 08:33:53

%S 1,4,56,3900,16015496,140897335664,4437432714568987812822

%N Number of (undirected) Hamiltonian cycles in the n-polygon diagonal intersection graph.

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianCycle.html">Hamiltonian Cycle</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonDiagonalIntersectionGraph.html">Polygon Diagonal Intersection Graph</a>

%Y Cf. A294992, A300525, A300551.

%K nonn,more,changed

%O 3,2

%A _Eric W. Weisstein_, Mar 08 2018

%E a(8)-a(9) from _Andrew Howroyd_, Mar 11 2018