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A147406
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Number of n X n binary arrays symmetric under horizontal 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, 5, 1, 9, 9, 43, 127, 501, 1169, 21077, 14501, 1245641, 426195, 52418221, 46737495, 4157184667, 7896602235, 878958425775, 1373529372451, 470697855207829, 348267628548895, 343015836691596183
(list; graph; refs; listen; history; internal format)
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