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A146137
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 149, 307, 3283, 9637, 237685, 792401, 149008323, 690862749, 219427051049, 1350088886833, 717485827831517, 5812692511149509, 9087725403509413361, 98388300257852844757, 382960435361198474272451
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