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A237430 Number of nonisomorphic Hamiltonian cycles on 2n X 2n square grid of points with two-fold rotational symmetry (and no other symmetry). 2

%I #13 Jun 30 2023 10:26:01

%S 0,0,5,366,129871,174041330,1343294003351,41725919954578785,

%T 7159149948562719664049,5065741493544986113047994120

%N Number of nonisomorphic Hamiltonian cycles on 2n X 2n square grid of points with two-fold rotational symmetry (and no other symmetry).

%H Ed Wynn, <a href="http://arxiv.org/abs/1402.0545">Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs</a>, arXiv:1402.0545 [math.CO], 2014.

%F a(n) = A227257(n) - A237429(n).

%e An example of each isomorphism class for n=3.

%e o-o-o-o-o-o o-o-o-o-o-o o-o-o-o-o-o o-o-o-o o-o o-o-o-o o-o

%e | | | | | | | | | | | | | |

%e o-o-o-o o-o o o-o-o-o-o o o-o o-o-o o-o o-o o o o o-o o-o o

%e | | | | | | | | | | | | | | | |

%e o-o-o-o o-o o o-o-o-o-o o o o o o-o o-o o-o-o o o-o o o-o-o

%e | | | | | | | | | | | | | |

%e o-o o-o-o-o o-o-o-o-o o o-o o o o o o o-o-o o-o o-o-o o o-o

%e | | | | | | | | | | | | | | | |

%e o-o o-o-o-o o-o-o-o-o o o-o-o o-o o o o o-o o-o o o-o o-o o

%e | | | | | | | | | | | | | |

%e o-o-o-o-o-o o-o-o-o-o-o o-o-o-o-o-o o-o o-o-o-o o-o o-o-o-o

%Y Cf. A209077, A227257, A237429.

%K nonn,walk,more

%O 1,3

%A _Ed Wynn_, Feb 07 2014

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Last modified September 16 16:54 EDT 2024. Contains 375976 sequences. (Running on oeis4.)