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A144059
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Number of n X n binary arrays, symmetric under 180 degree rotation, with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.
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0
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1, 2, 7, 43, 317, 4395, 85883, 3189035, 155707292, 14992855085, 1844750664909, 446183107764907, 140966932321586720
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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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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