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A145932
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.
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0
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1, 1, 1, 5, 20, 85, 428, 3123, 34838, 454719, 8335296, 187056538, 6169076015, 247329264689, 14010937295624, 978281276679416, 99281241941019762, 12290336204514423117
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.1.1.1.0.1
.1.0.0.0.1.0.1.1
.1.1.0.1.0.0.0.1
.1.0.1.1.1.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
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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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