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A145952
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Number of n X n binary arrays with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 9, 33, 333, 7127, 205501, 11166945, 1122739259, 190153543115, 56969419979245, 30406497496961445, 28371939730808217655
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