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A146146
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 97, 97, 863, 863, 18767, 18767, 490889, 490889, 19713443, 19713443, 1413873475, 1413873475, 167866752937, 167866752937, 30662833126025, 30662833126025
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OFFSET
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1,7
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
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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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