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A147191
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.
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1, 1, 1, 1, 1, 1, 1, 3, 11, 21, 45, 95, 317, 775, 2631, 8089, 34521, 128479, 651913, 2804553, 16941209, 86096205, 609652687
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