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A238816 Number of Hamiltonian cycles on 2n X 2n grid with at least the symmetry of reflection in an axis. 0
1, 4, 44, 2828, 564468, 754425400, 3079904455096, 88444819222239178, 7685637690960745082050, 4793315937811919497089287562 (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: A157193 A224784 A243221 * A327196 A024254 A167781

Adjacent sequences:  A238813 A238814 A238815 * A238817 A238818 A238819

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 05 2014

STATUS

approved

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Last modified January 24 07:18 EST 2020. Contains 331189 sequences. (Running on oeis4.)