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A145796
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either four adjacent vertically or four adjacent horizontally.
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0
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1, 1, 1, 3, 9, 16, 93, 367, 2220, 13167, 126326, 1163166, 15908600, 209043350, 4432902382, 88370483688
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text;
internal format)
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OFFSET
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1,4
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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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