OFFSET
0,1
EXAMPLE
tanh(tanh(x)*tan(x))=2/2!*x^2-128/6!*x^6+12032/10!*x^10...
MATHEMATICA
Tanh[ Tanh[ x ]*Tan[ x ] ] (* [ x^(4n+2) ] *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved