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A147130
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 25, 71, 443, 1859, 9601, 64045, 595391, 5302231, 72852715, 980189123, 19962381129
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.1.1.0.0.0.1
.0.1.0.0.1.1.1.1
.0.1.0.0.0.0.0.1
.0.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.0
.1.0.0.0.0.0.1.0
.1.1.1.1.0.0.1.0
.1.0.0.0.1.1.1.1
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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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