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A147407
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 5, 9, 21, 25, 109, 61, 921, 265, 6141, 2725, 55969, 40501, 883289, 485293, 21802429, 5980517, 645447537, 124941205
(list; graph; refs; listen; history; internal format)
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