A012036 tan(sin(arcsinh(x)))=x-4/5!*x^5+32/7!*x^7+80/9!*x^9-34048/11!*x^11...

1, 0, -4, 32, 80, -34048, 5048512, -984048128, 246504417536, -76892124225536, 29350173573487616, -13506119868179701760, 7388967312556159062016, -4745632815309786449379328, 3538391474251613805070172160

Offset

0,3

Links

Vaclav Kotesovec, Table of n, a(n) for n = 0..200

Formula

a(n) ~ (-1)^n * c * (2*n)! / sqrt(n), where c = 0.05565047582054219883411112937... . - Vaclav Kotesovec, Feb 03 2015

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 19 2014 *)

Crossrefs

Sequence in context: A138340 A113250 A329910 * A153794 A222326 A370082

Adjacent sequences: A012033 A012034 A012035 * A012037 A012038 A012039

Keyword

sign

Author

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

Status

approved