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A227257
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Number of Hamiltonian circuits in a 2n X 2n square lattice of nodes, reduced for symmetry, where the orbits under the symmetry group of the square, D4, have 4 elements.
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6
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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When n = 2, there is only 1 Hamiltonian circuit in a 4 X 4 square lattice, where the orbits under the symmetry group of the square have 4 elements. The 4 elements are:
o__o__o__o o__o__o__o o__o__o__o o__o o__o
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o o__o__o o o__o o o__o__o o o o o o
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o o__o__o o o o o o__o__o o o o__o o
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o__o__o__o o__o o__o o__o__o__o o__o__o__o
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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a(5)-a(10) from Ed Wynn, Feb 05 2014
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STATUS
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approved
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