arctanh(arcsinh(x)*tan(x))=2/2!*x^2+4/4!*x^4+350/6!*x^6+7208/8!*x^8...

A012618

arctanh(arcsinh(x)*tan(x))=2/2!*x^2+4/4!*x^4+350/6!*x^6+7208/8!*x^8...

Terms

    a(0) =0a(1) =2a(2) =4a(3) =350a(4) =7208a(5) =1520218a(6) =106485740a(7) =38051376246

External references