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A146931
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 7, 14, 22, 37, 79, 162, 380, 937, 2496, 7209, 22236, 73304, 252500, 902438, 3477063, 13836097, 60384897, 273397251, 1352635265, 7039542506, 39611966803
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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
.1.0.0.1.0.1.1.1
.1.1.1.1.0.0.1.0
.1.0.0.1.0.0.1.0
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.0.1.0.0.1.0.0.1
.0.1.0.0.1.1.1.1
.1.1.1.0.1.0.0.1
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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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