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A146664
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 19, 43, 87, 303, 1077, 3757, 15681, 80673, 475263, 2975253, 20229343, 160250909, 1366441107, 13345035623
(list; graph; refs; listen; history; internal format)
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