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A146923
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 6, 12, 19, 29, 56, 159, 456, 1350, 3940, 11848, 42451, 167584, 713562, 3187201
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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
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
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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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