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A147404
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 5, 1, 9, 13, 53, 137, 741, 2493, 19441, 73321, 1016967, 4911015, 87040405, 643897713
(list; graph; refs; listen; history; internal format)
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