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A146142
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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 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, 3, 23, 43, 81, 319, 1397, 6447, 41775, 230237, 1798489, 13587111, 143546329, 1450499749, 20575847369, 276390467445, 5233548027451, 93375391444657
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