A238818 Number of Hamiltonian cycles on 2n X 2n grid with at least the symmetries of two reflections and 180-degree rotation.

1, 2, 6, 40, 488, 13782, 757626, 95835196, 24236840344, 13996574799274

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.