36620830720domain: NAppears in sequencesExpansion of e.g.f.: log(1+tan(tanh(x))).at n=15A009367arctanh(tan(tanh(x)))=x+2/3!*x^3+16/5!*x^5+496/7!*x^7+24064/9!*x^9...at n=7A012171