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A145938
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.
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0
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1, 3, 7, 23, 131, 971, 9431, 139347, 2886057, 82544813, 3341873733, 191910369845, 15522222886741, 1764362997792863, 282874498672615023, 64026362228967252845, 20418507275512768653401, 9173719646436780783498511
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.0.1.0.1.1.0
.1.0.1.1.0.1.0.1
.0.1.0.0.1.0.1.1
.1.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.1
.1.1.0.1.0.0.1.0
.1.0.1.0.1.1.0.1
.0.1.1.0.1.0.1.1
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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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