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A147511
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 9, 15, 29, 57, 137, 413, 1389, 4485, 15371, 54209, 224739, 1032991, 5497929, 29140255, 171761393, 1058704295, 7315438183
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OFFSET
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1,8
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.0.0.0.1.1.1.1
.1.1.0.1.1.1.1.0
.1.1.0.0.0.0.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.0.0.0.0.1.1
.0.1.1.1.1.0.1.1
.1.1.1.1.0.0.0.1
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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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