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A012732
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cos(arctanh(x)*atan(x)) = 1-12/4!*x^4-9968/8!*x^8-77575872/12!*x^12...
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0
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1, -12, -9968, -77575872, -2494079278848, -227607911866125312, -47454799045677121597440, -19613396255307422099013550080, -14538029942147907114791552602275840
(list; graph; refs; listen; history; internal format)
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