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A146423
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 229, 229, 1773, 1773, 39925, 39925, 1086663, 1086663, 55544427, 55544427, 4442151653, 4442151653
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OFFSET
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1,9
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LINKS
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EXAMPLE
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Maximal 9 X 9 example
.1.1.1.1.0.1.1.1.1
.1.0.1.0.0.0.1.0.1
.0.1.0.1.0.1.0.1.0
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.0.1.0.1.0.1.0.1.0
.1.0.1.0.0.0.1.0.1
.1.1.1.1.0.1.1.1.1
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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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