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A012108 cosh(arcsin(sinh(x)))=1+1/2!*x^2+9/4!*x^4+201/6!*x^6+9649/8!*x^8... 0
1, 1, 9, 201, 9649, 809201, 105268089, 19650225401, 4982657935329, 1648151554792801, 689411371817131369, 355814217290199455401, 222111401946937825176209, 164952387078229730219557201 (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[ArcSin[Sinh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 19 2015 *)

CROSSREFS

Sequence in context: A012168 A012133 A012038 * A251587 A103914 A211039

Adjacent sequences:  A012105 A012106 A012107 * A012109 A012110 A012111

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified January 16 18:17 EST 2022. Contains 350376 sequences. (Running on oeis4.)