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A146415
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 18, 9, 192, 29, 1571, 137, 16589, 1117, 263101, 13601, 7736259, 257342, 336101213, 6436423, 19847949792, 229848194
(list; graph; refs; listen; history; internal format)
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