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A147104
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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 1000-1000-1100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 33, 33, 93, 93, 429, 429, 2069, 2069, 10289, 10289, 55429, 55429, 387995, 387995
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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
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
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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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