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A238818 Number of Hamiltonian cycles on 2n X 2n grid with at least the symmetries of two reflections and 180 degree rotation. 0
1, 2, 6, 40, 488, 13782, 757626, 95835196, 24236840344, 13996574799274 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

Ed Wynn, Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs, arXiv preprint arXiv:1402.0545, 2014

CROSSREFS

Cf. A003763.

Sequence in context: A081471 A133939 A045846 * A199574 A320489 A135755

Adjacent sequences:  A238815 A238816 A238817 * A238819 A238820 A238821

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 05 2014

STATUS

approved

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Last modified January 18 01:05 EST 2020. Contains 330995 sequences. (Running on oeis4.)