A012381 arcsinh(tan(x)*arcsin(x))=2/2!*x^2+12/4!*x^4+70/6!*x^6-4200/8!*x^8...

2, 12, 70, -4200, -347702, 8053540, 8370022414, 1537444327216, -75026900539758, -163917764618098628, -46635653602838486826, 19561200248822504710856, 28903055462807082203920986

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: A357831 A012426 A012421 * A012376 A223763 A361960

Adjacent sequences: A012378 A012379 A012380 * A012382 A012383 A012384

Keyword

sign

Author

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

Status

approved