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A166380
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Diagonal sums of exponential Riordan array [1+x^2*sec(x),x], A166378.
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1
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1, 3, 19, 223, 4667, 160045, 8207125, 587420875, 55869454855, 6809387511403, 1034264079708019, 191477762192490649, 42435372869814513769, 11090351278621719882899, 3374951549996881393302715
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