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A012381 arcsinh(tan(x)*arcsin(x))=2/2!*x^2+12/4!*x^4+70/6!*x^6-4200/8!*x^8... 0
2, 12, 70, -4200, -347702, 8053540, 8370022414, 1537444327216, -75026900539758, -163917764618098628, -46635653602838486826, 19561200248822504710856, 28903055462807082203920986 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[Tan[x]ArcSin[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Jul 16 2016 *)

CROSSREFS

Sequence in context: A143357 A012426 A012421 * A012376 A223763 A002630

Adjacent sequences:  A012378 A012379 A012380 * A012382 A012383 A012384

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified March 28 17:07 EDT 2020. Contains 333089 sequences. (Running on oeis4.)