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A147508
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11110-01111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 23, 81, 267, 1053, 6173, 40853, 301993, 2684783, 27089119, 322029889, 4723820567, 81998776493, 1660922956591, 39864394187483, 1124746291185333
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