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A238817 Number of Hamiltonian cycles on 2n X 2n grid with at least 180 degree rotational symmetry. 0

%I

%S 1,2,28,1504,520176,696179102,5373177281748,166903679914150336,

%T 28636599794306124116062,20262965974179958448766775754

%N Number of Hamiltonian cycles on 2n X 2n grid with at least 180 degree rotational symmetry.

%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, 2014

%Y Cf. A003763.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Mar 05 2014

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Last modified January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)