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%I #15 Jun 30 2023 12:21:27
%S 1,2,6,40,488,13782,757626,95835196,24236840344,13996574799274
%N Number of Hamiltonian cycles on 2n X 2n grid with at least the symmetries of two reflections and 180-degree rotation.
%H Ed Wynn, <a href="http://arxiv.org/abs/1402.0545">Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs</a>, arXiv preprint arXiv:1402.0545 [math.CO], 2014.
%Y Cf. A003763.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Mar 05 2014
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