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A146593
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 21, 51, 327, 1675, 7635, 91085, 1248699, 15566521, 331389569, 6715390709, 209774176475, 7949748988669, 377908421650787
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