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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
OFFSET
1,2
LINKS
CROSSREFS
Cf. A003763.
Sequence in context: A157193 A224784 A243221 * A327196 A024254 A167781
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 05 2014
STATUS
approved