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A145999
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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 plus 2,1 2,2 2,3 1,2 3,2.
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0
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1, 1, 2, 1, 2, 1, 7, 2, 23, 5, 132, 12, 836, 51, 8563, 317, 115954, 2654, 2274857, 30351, 60964251, 489559, 2304941344, 11104536, 120886008663, 350752586, 8909697213591, 15493779226, 915528841065256, 954798521885
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
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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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