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A146047
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.
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0
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1, 1, 1, 1, 13, 19, 471, 1011, 17363, 51133, 4227773, 17426251, 4189737457, 23548416611, 8347118368027, 61971666176727, 58964882823496375, 583865226098623749, 1588500435723596374221, 21184137467738936180415
(list; graph; refs; listen; history; internal format)
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