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A238817 Number of Hamiltonian cycles on 2n X 2n grid with at least 180 degree rotational symmetry. 0
1, 2, 28, 1504, 520176, 696179102, 5373177281748, 166903679914150336, 28636599794306124116062, 20262965974179958448766775754 (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: A324077 A071220 A063794 * A202942 A326366 A177400

Adjacent sequences:  A238814 A238815 A238816 * A238818 A238819 A238820

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 05 2014

STATUS

approved

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Last modified January 26 23:05 EST 2020. Contains 331289 sequences. (Running on oeis4.)