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A146049
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Number of n X n binary arrays symmetric about main diagonal with all 1's connected only in a 2 X 2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.
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0
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1, 1, 1, 3, 13, 35, 181, 1303, 13131, 161693, 2592581, 57377381, 1720164275, 69927099465, 3715147371129, 261988046119405, 24980387570081613, 3210146525819915095, 550205755804555982181, 125514016677735094761717
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