arcsin(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+647072/10!*x^10...

A012668

arcsin(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+647072/10!*x^10...

Terms

    a(0) =2a(1) =232a(2) =647072a(3) =11510902912

External references