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A238819
Number of Hamiltonian cycles on 4n+2 X 4n+2 grid with at least 90-degree rotational symmetry.
1
1, 2, 204, 510718, 31008619522, 43911490791183200, 1424639466911800364132674, 1048492580133908850434091619741314
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..7.
Ed Wynn,
Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs
, arXiv preprint arXiv:1402.0545 [math.CO], 2014.
CROSSREFS
Cf.
A003763
.
Sequence in context:
A349982
A209185
A216608
*
A110899
A281126
A220940
Adjacent sequences:
A238816
A238817
A238818
*
A238820
A238821
A238822
KEYWORD
nonn
AUTHOR
N. J. A. Sloane
, Mar 05 2014
EXTENSIONS
a(5)-a(7) from
Andrew Howroyd
, Apr 06 2016
STATUS
approved
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Last modified May 31 12:12 EDT 2023. Contains 363066 sequences. (Running on oeis4.)