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A145764
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally.
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0
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1, 1, 5, 5, 24, 73, 566, 2483, 32841, 234437, 5307036, 61459976, 2279718182, 44700555075, 2739362168120, 88170556642974, 8988213154883058
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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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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