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A147238
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 21, 51, 289, 1391, 7677, 54075, 500683, 5608015, 82262213, 1433087781
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