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A146778
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 43, 145, 633, 4131, 31831, 267243, 2665825, 33726547, 521722083, 9834245987, 228276099483, 6476476460303, 221310304612835, 9127636122908961
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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
.0.0.1.1.1.1.0.0
.0.0.1.0.1.0.0.0
.1.1.0.0.1.0.0.1
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.1.0.0.1.0.0.1.1
.0.0.0.1.0.1.0.0
.0.0.1.1.1.1.0.0
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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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