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A119883
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E.g.f. (1+2x+x^2/2)*sech(x).
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0
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1, 2, 0, -6, -1, 50, 14, -854, -323, 24930, 11804, -1111462, -631621, 70271890, 46590634, -5980829430, -4531805575, 659311412930, 562021682744, -91385427666758, -86555950096265, 15555589905976050, 16206870089730374, -3190048222084343446, -3625755168948973771
(list; graph; refs; listen; history; internal format)
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