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A146227
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 13, 37, 183, 817, 5601, 59649, 681701, 9890411, 176577709, 3939621645, 118135623109, 4491780681983, 213414295100783, 12753739646336971, 960252990758480757, 92263548659475375193
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