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A146649
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Number of n X n binary arrays symmetric under 180 degree rotation 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, 5, 25, 55, 257, 1343, 7017, 52361, 533979, 5651335, 90178433, 1487870527, 34319557235, 869941319597
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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
.0.1.1.1.0.1.1.1
.0.0.1.0.0.0.1.0
.0.0.1.1.0.0.1.1
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.1.1.0.0.1.1.0.0
.0.1.0.0.0.1.0.0
.1.1.1.0.1.1.1.0
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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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