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A146573
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 9, 27, 93, 387, 2257, 17737, 161709, 1791979, 24472267, 411254805, 8803299545, 237567838361, 7943030744455, 326428801034421, 16521809851219021, 1042915737664638031
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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
.0.1.1.1.1.0.0.0
.1.0.0.1.0.0.0.0
.1.0.0.1.0.0.0.0
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.0.0.0.0.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.0.1.1.1.1.0
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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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