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A009157 Expansion of cosh(tan(sin(x))). 0
1, 1, 5, 13, -855, -38791, -747539, 59637061, 9421489105, 573991066225, -49290541346219, -20481513828195331, -2616109089676671623, 259051585957836649961, 218489079668015355338557, 45857020942077467007882293, -6052305324824723639484616287 (list; graph; refs; listen; history; text; internal format)
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 * A153374 A247789 A012032

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

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Last modified August 9 01:18 EDT 2022. Contains 356016 sequences. (Running on oeis4.)