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A145864
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in two by two blocks.
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0
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1, 2, 1, 4, 8, 25, 59, 294, 976, 6868, 36894, 351022, 2656603, 36966909, 391525649, 7896337875, 122564741600, 3503953133171, 77993874405982, 3210152559844391, 101979707965980254, 6040428902857902560, 276387013896712513044
(list; graph; refs; listen; history; internal format)
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