arcsinh(sec(x)*arctanh(x))=x+4/3!*x^3+28/5!*x^5+152/7!*x^7+6928/9!*x^9...

A012847

arcsinh(sec(x)*arctanh(x))=x+4/3!*x^3+28/5!*x^5+152/7!*x^7+6928/9!*x^9...

Terms

    a(0) =1a(1) =4a(2) =28a(3) =152a(4) =6928a(5) =2225408a(6) =348750400a(7) =38567316608

External references