OFFSET
0,2
FORMULA
a(n) ~ (2*n)! * 4^(n+1) * sin(sinh(Pi/2)) / Pi^(2*n+1). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Tan[ x ]*Sin[ Sinh[ x ] ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Sin[Sinh[x]]*Tan[x], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested Mar 15 1997 by Olivier Gérard.
STATUS
approved