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A146669
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 7, 21, 49, 219, 1317, 9715, 80153, 817961, 10735885, 177805125, 3599071193, 90866799531, 2886601451049, 113383289044153, 5503065770566291
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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
.0.0.1.1.1.0.0.0
.0.1.0.1.1.0.0.1
.0.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.0
.1.0.0.1.1.0.1.0
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
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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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