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A147237
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Number of n X n binary arrays symmetric under 90 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, 1, 1, 3, 19, 37, 71, 177, 551, 1807, 6509, 26627, 139987, 688205, 4186827, 24218141, 169157335, 1233973193
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