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A047681
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3^(2*n)*(3^(2*n)-1)*bernoulli(2*n)/(2*n).
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0
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6, -54, 2106, -179334, 26414586, -5957217414, 1906398972666, -821369346492294, 458382160232420346, -321645776191296739974, 277173760840187306341626, -287758284647458145849816454, 354245505704926834826124160506, -510230879113388713374134585497734
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