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A147474
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 11, 35, 119, 483, 1553, 7807, 47813, 363745, 2696139
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