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A146665
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 25, 67, 401, 2363, 17629, 144263, 1829205, 25576287, 554261927, 12075864101
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OFFSET
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1,5
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.1.1.0.0.1.1
.1.1.1.0.1.1.1.0
.1.0.0.0.1.0.0.1
.0.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.0
.1.0.0.1.0.0.0.1
.0.1.1.1.0.1.1.1
.1.1.0.0.1.1.0.0
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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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