sinh(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+405152/10!*x^10...

A012671

sinh(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+405152/10!*x^10...

Terms

    a(0) =2a(1) =232a(2) =405152a(3) =3115956352

External references