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A293261
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Number of fixed polyominoes without holes that have a width and height of n.
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2
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1, 5, 106, 6074, 943340, 419355340, 554485727288, 2208574156731474, 26609978139626497670, 973224195603423767343946, 108342096917091380628767818812, 36763211016528549310068224122368860, 38044287043749436284594644308861499605492
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OFFSET
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1,2
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COMMENTS
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Equivalently, the number of cycles on an (n+1) X (n+1) grid that touch each of the four outside edges.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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