OFFSET
0,4
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..250
EXAMPLE
cos(tanh(log(1+x))) = 1 +0*x/1! -1*x^2/2! +3*x^3/3! -2*x^4/4! -40*x^5/5! +...
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Cos[Tanh[Log[1+x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 07 2012 *)
PROG
(PARI) x='x+O('x^30); Vec(serlaplace(cos(tanh(log(1+x))))) \\ G. C. Greubel, Jul 24 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Tanh(Log(1+x))))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 24 2018
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Definition clarified by Harvey P. Dale, Sep 07 2012
STATUS
approved