tanh(arctan(x)*sin(x))=2/2!*x^2-12/4!*x^4-50/6!*x^6+12936/8!*x^8...

A012427

tanh(arctan(x)*sin(x))=2/2!*x^2-12/4!*x^4-50/6!*x^6+12936/8!*x^8...

Terms

    a(0) =2a(1) =-12a(2) =-50a(3) =12936a(4) =-885062a(5) =19509820a(6) =8446530118

External references