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 A013099 arctanh(arcsinh(x)+tan(x)) = 2*x+17/3!*x^3+873/5!*x^5+110127/7!*x^7... 0
 2, 17, 873, 110127, 25968897, 9837102007, 5465752395569, 4187179894797967, 4229947817463760257, 5448264281798198909031, 8714522311726067909334321, 16946786732387040593899895551 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..11. FORMULA a(n) ~ (2*n)! / r^(2*n+1), where r = 0.48741523182648... is the root of the equation log(sqrt(r^2+1)-r) = tan(r)-1. - Vaclav Kotesovec, Oct 24 2013 MATHEMATICA Table[n!*SeriesCoefficient[ArcTanh[ArcSinh[x]+Tan[x]], {x, 0, n}], {n, 1, 41, 2}] (* Vaclav Kotesovec, Oct 24 2013 *) CROSSREFS Sequence in context: A167436 A015189 A012944 * A013060 A012988 A261535 Adjacent sequences: A013096 A013097 A013098 * A013100 A013101 A013102 KEYWORD nonn AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) STATUS approved

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Last modified December 4 15:41 EST 2023. Contains 367563 sequences. (Running on oeis4.)