OFFSET
0,3
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) * (1+1/sqrt(2))^n. - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Log[ 1+Sinh[ Log[ 1+x ] ] ]
CoefficientList[Series[Log[(2 + 4*x + x^2)/(2 + 2*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