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A146063
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Number of n X n binary arrays with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 5, 17, 53, 497, 10289, 196357, 5677027, 310742317, 27512226687, 3369038880519, 646981592661815, 203366474520147193
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