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A147215
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 17, 41, 71, 215, 773, 2523, 9517, 44347, 255961, 1482711, 8989887, 64060215, 492775957, 4232478379
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