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A146418
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 9, 3, 31, 9, 107, 21, 365, 62, 1813, 243, 11236, 1174, 84454, 7129, 738542, 48787, 7473236, 396149
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OFFSET
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1,9
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LINKS
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0
.0.0.0.0.1.0.0.0.0
.1.0.0.0.1.0.0.0.1
.1.1.1.1.0.1.1.1.1
.1.0.0.0.1.0.0.0.1
.0.0.0.0.1.0.0.0.0
.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0
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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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