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A146128
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.
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0
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1, 1, 1, 1, 9, 13, 45, 103, 3361, 8833, 372663, 1287127, 106100985, 471171193, 109709730093, 638573372655, 304442910936313, 2309148561615411, 2461266528050264151, 24325578567487185537, 57639766702959393452219
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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
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
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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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