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A146069
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Number of n X n binary arrays symmetric under 90 degree rotation 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, 9, 21, 35, 101, 287, 859, 3329, 15189, 75035, 399377, 2204921, 14787995, 102936591, 860535039, 7743744003, 81593423043, 911784626279
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