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A146810
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 7, 19, 47, 187, 1053, 6641, 45779, 382213, 4162011, 56301753, 896342697, 17171206379, 405427693543, 11818746061515, 417444288436423
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