sin(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+112032/10!*x^10...

A012728

sin(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+112032/10!*x^10...

Terms

    a(0) =2a(1) =88a(2) =112032a(3) =339519360

External references