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A146597
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 7, 19, 51, 237, 1335, 8829, 68891, 649429, 7839465, 116522409, 2129542541, 47609599737, 1308687213295, 44429361526611, 1853713445956347
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