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A147121
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 7, 23, 49, 87, 207, 721, 2133, 8229, 34269, 162105, 830967, 4627991, 26390809, 175258607
(list; graph; refs; listen; history; internal format)
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