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

1, 2, 28, 1504, 520176, 696179102, 5373177281748, 166903679914150336, 28636599794306124116062, 20262965974179958448766775754

Offset: 1

Author

N. J. A. Sloane, Mar 05 2014

Keywords

• nonn
• more

Links

• Ed Wynn, Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs, arXiv preprint arXiv:1402.0545 [math.CO], 2014.

Crossrefs

Cf. A003763.