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A146853
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 15, 39, 71, 173, 597, 1851, 6753, 30359, 143255, 790071, 4528523, 29159423, 204966875, 1600354339
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