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A146720
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 17, 43, 65, 175, 507, 1901, 7015, 35249, 143079, 849399, 4342589, 31597665, 199056275, 1767268871
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