OFFSET
0,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / cos(1). - Vaclav Kotesovec, Jan 23 2015
EXAMPLE
log(1+x)/cos(x) = 0 + x - 1/2*x^2 + 5/6*x^3 - 1/2*x^4 + 23/40*x^5 -+ ...
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Log[1+x]/Cos[x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 26 2013 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved