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A012158
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sech(tan(sinh(x)))=1-1/2!*x^2-7/4!*x^4-73/6!*x^6-239/8!*x^8...
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1, -1, -7, -73, -239, 95311, 12793417, 1502683335, 172513245857, 17253776069663, 455220048522521, -596864160295290537, -305119961556198266191, -109834061252143977404561
(list; graph; refs; listen; history; internal format)
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