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A147373
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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 0111-1100-0111 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, 8, 3, 22, 9, 79, 19, 256, 42, 946, 149, 4545, 642, 27699, 3217
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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
.0.0.0.1.1.1.0.0.0
.1.1.1.0.1.0.1.1.1
.0.0.1.1.0.1.1.0.0
.1.1.1.0.1.0.1.1.1
.0.0.0.1.1.1.0.0.0
.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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