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A147399
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 45, 45, 217, 217, 1729, 1729, 28581, 28581, 422837, 422837, 7769557, 7769557, 212491441, 212491441
(list; graph; refs; listen; history; internal format)
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