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A367436
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Number of Hamiltonian cycles in the polyomino graph PG(n) defined in A367435.
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4
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OFFSET
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1,4
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COMMENTS
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A cycle and its reverse are not both counted.
We follow the convention in A003216 that the complete graphs on 1 and 2 nodes have 1 and 0 Hamiltonian cycles, respectively, so that a(1) = a(2) = 1 and a(3) = 0, but it could also be argued that a(1) = a(2) = 0 and/or a(3) = 1.
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LINKS
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FORMULA
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a(n) > 0 for 4 <= n <= 13.
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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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STATUS
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approved
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