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A146845
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 13, 35, 61, 141, 427, 1351, 4209, 19211, 75163, 402147, 1986547, 12595631, 74795099, 557304499
(list; graph; refs; listen; history; internal format)
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