OFFSET
0,6
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / cosh(sin(1)). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Log[ 1+x ]/Cosh[ Sin[ x ] ]
CoefficientList[Series[Log[1 + x]*Sech[Sin[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved