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A145928
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.
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0
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1, 1, 1, 3, 10, 33, 134, 947, 8780, 97821, 1375312, 27712816, 754977953, 26645291289, 1208294585650, 74271003442168, 6124346294290730, 668846422203976047, 95426817845827533968, 18141398847837127162392
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