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A146475
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 9, 15, 35, 57, 245, 579, 3057, 8465, 49975, 173815, 1305505, 5674409, 52338659, 276967501, 3125019047, 20455456921, 286529633207, 2318729204115
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