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A146194
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 13, 33, 61, 131, 505, 1541, 6387, 29305, 198459, 1139657, 7455433, 47764793, 415936701, 3457440839, 39284046163, 428565300485, 6364187322071
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