OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..239
MAPLE
seq(coeff(series(factorial(n)*cos(tanh(x))/cos(x), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 25 2018
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cos[Tanh[x]]/Cos[x], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jul 14 2018 *)
PROG
(PARI) x='x+O('x^50); v=Vec(serlaplace(cos(tanh(x))/cos(x))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 25 2018
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Prior Mathematica program replaced by Harvey P. Dale, Jul 14 2018
STATUS
approved