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A146640
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 17, 43, 75, 161, 539, 2129, 8565, 42667, 183445, 1039641, 5959305, 43560487, 311334093, 2752013037
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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
.0.1.0.0.1.0.1.0
.1.1.0.0.1.1.1.1
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.1.1.1.1.0.0.1.1
.0.1.0.1.0.0.1.0
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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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