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 A012220 cosh(arctan(arcsinh(x)))=1+1/2!*x^2-11/4!*x^4+349/6!*x^6-22007/8!*x^8... 0
 1, 1, -11, 349, -22007, 2312601, -365164227, 80916522933, -23968582079343, 9151870592718513, -4378918837383018747, 2566828786036427906445, -1809533477302236292739175, 1510703360292377534570508105 (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[Cosh[ArcTan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Nov 06 2020 *) CROSSREFS Sequence in context: A279238 A192841 A158788 * A012138 A067428 A171630 Adjacent sequences: A012217 A012218 A012219 * A012221 A012222 A012223 KEYWORD sign AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) STATUS approved

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Last modified December 7 17:34 EST 2023. Contains 367659 sequences. (Running on oeis4.)