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A146032
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 79, 79, 523, 523, 9169, 9169, 183491, 183491, 4964583, 4964583, 219022025, 219022025, 16321424419, 16321424419, 1718337883769, 1718337883769, 267799571260427, 267799571260427
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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
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
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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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