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A146605
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 19, 59, 237, 1193, 6925, 46535, 385115, 3834729, 46129325, 665267927, 11525172145, 240724568637, 6036636466243, 182136263500283, 6609883325424453
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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
.0.0.0.1.1.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.0.1.0.0.0
.1.0.0.0.1.1.0.0
.1.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
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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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