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A146406
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 21, 669, 1435, 18911, 48821, 1583279, 5119381, 552048095, 2284826569, 405071372171, 2114490125109, 687967929796833, 4506360355608779, 2940096330466050229, 24177384329604438229
(list; graph; refs; listen; history; internal format)
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