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A145949
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.
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0
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1, 1, 1, 1, 3, 15, 35, 85, 321, 1353, 7451, 43415, 311247, 2524635, 23996463, 265026943, 3465054275, 52737773951, 953864284885, 19856088270267, 488084993258793
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