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A012167 cosh(tan(arcsinh(x)))=1+1/2!*x^2+5/4!*x^4+61/6!*x^6+937/8!*x^8... 2
1, 1, 5, 61, 937, 41881, 259181, 225924245, -25529526319, 8376428366257, -2542034772205739, 1049519923013252461, -506849756298097166215, 294020276106503596553801, -199395048123852155910464323 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cosh[Tan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 25 2020 *)

CROSSREFS

A012167(n)=A012159(2*n)

Sequence in context: A236955 A064328 A012060 * A162167 A134282 A146760

Adjacent sequences:  A012164 A012165 A012166 * A012168 A012169 A012170

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified September 22 07:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)