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 A012137 arctan(arcsin(arctanh(x))) = x + (1/3!)*x^3 + (17/5!)*x^5 + (673/7!)*x^7 + (54305/9!)*x^9 + ... 0
 1, 1, 17, 673, 54305, 7334273, 1497501873, 430436005665, 165573876222529, 82074493484054017, 50922938856050558289, 38644611846710150572193, 35205379514991276523808353, 37909794281251146499011279233 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..13. MATHEMATICA With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcSin[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Jan 18 2020 *) CROSSREFS Sequence in context: A009158 A012050 A012157 * A171198 A309410 A201311 Adjacent sequences: A012134 A012135 A012136 * A012138 A012139 A012140 KEYWORD nonn AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) STATUS approved

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Last modified June 6 22:19 EDT 2023. Contains 363151 sequences. (Running on oeis4.)