A009157 Expansion of cosh(tan(sin(x))).

1, 1, 5, 13, -855, -38791, -747539, 59637061, 9421489105, 573991066225, -49290541346219, -20481513828195331, -2616109089676671623, 259051585957836649961, 218489079668015355338557, 45857020942077467007882293, -6052305324824723639484616287

Offset

0,3

Links

Table of n, a(n) for n=0..16.

Mathematica

With[{nn=40}, Take[CoefficientList[Series[Cosh[Tan[Sin[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Apr 22 2013 *)

Crossrefs

Sequence in context: A007540 A290171 A157250 * A396335 A153374 A247789

Adjacent sequences: A009154 A009155 A009156 * A009158 A009159 A009160

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

More terms from Harvey P. Dale, Apr 22 2013

Status

approved