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A012182 cosh(tan(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+721/6!*x^6+56545/8!*x^8... 0
1, 1, 17, 721, 56545, 7062241, 1283497841, 319471153457, 104260273696961, 43168502192389825, 22100367268731836881, 13703484478282258062481, 10117607255517016666964897, 8769262856125733251376413601 (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[Tan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 21 2015 *)

CROSSREFS

Sequence in context: A012137 A171198 A201311 * A012029 A012193 A128274

Adjacent sequences:  A012179 A012180 A012181 * A012183 A012184 A012185

KEYWORD

nonn

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified February 15 16:25 EST 2019. Contains 320136 sequences. (Running on oeis4.)