A012201 cosh(arctan(arcsin(x)))=1+1/2!*x^2-3/4!*x^4+69/6!*x^6-1159/8!*x^8...

1, 1, -3, 69, -1159, 115081, -3250827, 1156388557, -12628752143, 42394317198097, 2830775181039853, 4335882574518729045, 967557162609958010985, 1031578849176135526526105

Offset

0,3

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Cosh[ArcTan[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 26 2020 *)

Crossrefs

Sequence in context: A219070 A086223 A089455 * A284058 A012096 A012074

Adjacent sequences: A012198 A012199 A012200 * A012202 A012203 A012204

Keyword

sign

Author

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

Status

approved