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A146064
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 49, 91, 755, 1733, 17237, 43939, 2178205, 7075949, 921596877, 3869156215, 535678119399, 2790029976011, 707504525942961, 4543722915142743, 2950922408069540377, 23782316720866894839, 30573780517964151258947
(list; graph; refs; listen; history; internal format)
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