OFFSET
0,4
FORMULA
a(n) ~ n! * (-1)^(n+1) * exp(Pi/2) / ((1 - 2*exp(Pi/2) + 2*exp(Pi)) * arctan(1 - exp(-Pi/2))^(n+1)). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tan[Log[1+Tan[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 28 2012 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Definition clarified by Harvey P. Dale, Aug 28 2012
STATUS
approved