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A146471
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 13, 13, 69, 69, 457, 457, 6223, 6223, 127787, 127787, 3658281, 3658281, 163817453, 163817453, 11238713859, 11238713859, 1160267254915, 1160267254915
(list; graph; refs; listen; history; internal format)
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