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A146643
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 21, 589, 1201, 13235, 33481, 725903, 2170199, 155541033, 580262243, 73632762107, 340925948339, 71000074991097, 403351898789271, 137271400195382005, 952292305731741997
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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
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
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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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