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A147375
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Number of n X n binary arrays symmetric under 180 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, 5, 21, 61, 266, 891, 3074, 18035, 122510, 915879, 8736750, 97430523, 1219777035, 17287269221
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.1.0.0.0.1.0
.0.0.1.1.0.1.1.1
.1.1.1.0.0.1.0.1
.0.0.0.0.0.1.0.1
.1.0.1.0.0.0.0.0
.1.0.1.0.0.1.1.1
.1.1.1.0.1.1.0.0
.0.1.0.0.0.1.1.1
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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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