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A146648
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 7, 13, 45, 61, 187, 447, 2017, 5419, 35435, 111161, 866245, 3379807, 30738337, 147143823, 1633304661
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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
.0.0.0.0.1.1.1.0
.1.0.1.0.0.1.0.0
.1.1.1.1.0.1.1.0
.1.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.1
.0.1.1.0.1.1.1.1
.0.0.1.0.0.1.0.1
.0.1.1.1.0.0.0.0
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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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