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A146018
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
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0
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1, 1, 1, 1, 3, 13, 41, 219, 1033, 8217, 92671, 1241193, 21102313, 438374597, 11919134635, 429471270295, 20089457592037, 1200700834920789, 91306423605321353, 8917989878582336861
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