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A146940
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
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0
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1, 1, 1, 3, 5, 9, 19, 60, 189, 892, 3177, 18960, 89571, 754227, 4905159, 53337014, 466215312, 6729449504, 78188089715, 1533329125669
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.0.0.1.1.0.0
.1.1.0.0.1.1.0.0
.1.1.0.0.1.1.0.0
.1.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.1
.0.0.1.1.0.0.1.1
.0.0.1.1.0.0.1.1
.0.0.1.1.0.0.1.1
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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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