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A146436
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
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0
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1, 1, 3, 1, 3, 9, 23, 73, 239, 601, 4153, 14191, 114759, 580339, 5550888, 46368603, 562683992, 5393792447, 97221007962, 1178726702163, 29671069397702, 489244079163479
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