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A147121
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 7, 23, 49, 87, 207, 721, 2133, 8229, 34269, 162105, 830967, 4627991, 26390809, 175258607
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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
.1.0.0.0.0.1.1.1
.1.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.1
.1.1.1.0.0.0.0.1
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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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