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A012834 arcsin(sec(x)*tanh(x))=x+2/3!*x^3+40/5!*x^5+1192/7!*x^7+87680/9!*x^9... 0
1, 2, 40, 1192, 87680, 9890432, 1736725120, 424537276672, 139089326735360, 58613115790118912, 30905365440751206400, 19924657840958605361152, 15419390055940961625866240, 14105236549373087746555707392 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

nn=27; Select[CoefficientList[Series[ArcSin[Sec[x]Tanh[x]], {x, 0, nn}], x]Range[0, nn]!, #!=0&] (* Harvey P. Dale, Jul 26 2011 *)

CROSSREFS

Sequence in context: A012637 A127429 A322179 * A304448 A012241 A341589

Adjacent sequences:  A012831 A012832 A012833 * A012835 A012836 A012837

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified September 29 18:39 EDT 2022. Contains 357090 sequences. (Running on oeis4.)