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A146400
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 7, 21, 51, 261, 1539, 11759, 111585, 1296125, 18399415, 335874781, 7824897067, 229077144211, 8419643660275, 387472393043501, 22360944601180667
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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
.0.0.0.0.1.1.0.0
.0.0.0.0.1.0.0.0
.0.0.0.1.1.0.1.1
.0.0.1.0.1.0.1.0
.1.1.1.1.0.1.1.0
.1.0.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0
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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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