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A146813
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 17, 37, 69, 167, 487, 1595, 5107, 22241, 105661, 549863, 3071095, 17729121, 112871021, 819713685
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OFFSET
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1,7
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.1.1.1.1.0
.1.0.0.1.0.1.0.0
.1.1.0.1.0.0.0.0
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.0.0.0.0.1.0.1.1
.0.0.1.0.1.0.0.1
.0.1.1.1.1.0.0.0
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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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