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A147321
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 7, 16, 39, 109, 339, 1359, 6341, 32204, 186717, 1250465, 9543435, 82560858, 815884422, 9279731421, 121699162939, 1834559945393, 31585819621707
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