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A146177
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 13, 33, 61, 115, 431, 1359, 5125, 23279, 156491, 866819, 5189807, 30665629, 248556857, 1970821419, 20754531695, 214278299237
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