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A147026
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11111-01000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 9, 17, 35, 145, 589, 2723, 16121, 110705, 888953, 8435682, 98480917, 1294018001, 21003172843
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