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A147250
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 7, 15, 31, 125, 537, 2497, 11379, 73403, 564557, 5044749, 48150503, 565823439, 7944991263, 131881718303, 2468412664385
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