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A146912
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.
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0
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1, 1, 1, 3, 5, 9, 19, 57, 217, 857, 3619, 18707, 117969, 876253, 7474981, 73822321, 851878121, 11545709859, 183325972139, 3408618427993, 73952504878933, 1873630369319687, 55462085673863451, 1920965075733048401
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