arcsinh(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+353952/10!*x^10...

A012733

arcsinh(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+353952/10!*x^10...

Terms

    a(0) =2a(1) =88a(2) =353952a(3) =4859875200

External references