sin(arctan(x)*tan(x))=2/2!*x^2+40/6!*x^6-2688/8!*x^8-31712/10!*x^10...

A012445

sin(arctan(x)*tan(x))=2/2!*x^2+40/6!*x^6-2688/8!*x^8-31712/10!*x^10...

Terms

    a(0) =2a(1) =0a(2) =40a(3) =-2688a(4) =-31712a(5) =-13038080a(6) =-341144960a(7) =-124075126784

External references