A012038 cos(sin(arcsinh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8753/8!*x^8...

1, -1, 9, -201, 8753, -634481, 69292281, -10655767929, 2197620415201, -585914236294753, 196238045270790761, -80691386297887323561, 39976011626025680236049, -23490521419525456192130001

Offset

0,3

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Cos[Sin[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Feb 16 2012 *)

Crossrefs

Sequence in context: A012061 A012168 A012133 * A012108 A251587 A103914

Adjacent sequences: A012035 A012036 A012037 * A012039 A012040 A012041

Keyword

sign

Author

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

Status

approved