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A146218
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 10, 5, 44, 17, 490, 45, 4847, 317, 94850, 5736, 2753328, 99087, 124970926, 2137142, 7708832169, 81606063, 748069343112, 5341611544, 110489144610789, 471313494449
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OFFSET
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1,7
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
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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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